diff --git a/tests/fixtures/timeseries/timeseries_roles.json b/tests/fixtures/timeseries/timeseries_roles.json
index 3d7dc6a964c216c371d2fbf02806184ba25de700..dbf7fae69e68d058db7febc817663d7bf936f185 100644
--- a/tests/fixtures/timeseries/timeseries_roles.json
+++ b/tests/fixtures/timeseries/timeseries_roles.json
@@ -10,5 +10,11 @@
     "role": 5,
     "status": 0,
     "contact_id": 4
+  },
+  {
+    "id": 3,
+    "role": 1,
+    "status": 0,
+    "contact_id": 3
   }
 ]
diff --git a/tests/fixtures/timeseries/timeseries_timeseries_roles.json b/tests/fixtures/timeseries/timeseries_timeseries_roles.json
index c9b3fbc9c8c845e1bcbdfcc6362f14404441afdc..562603fe5fb62c67bb83b5eb893678a7c93b430c 100644
--- a/tests/fixtures/timeseries/timeseries_timeseries_roles.json
+++ b/tests/fixtures/timeseries/timeseries_timeseries_roles.json
@@ -4,6 +4,11 @@
     "timeseries_id": 1,
     "role_id": 2
   },
+  {
+    "_comment": "Every time series needs at least one role (time series without roles are not allowed!)",
+    "timeseries_id": 1,
+    "role_id": 3
+  },
   {
     "_comment": "Every time series needs at least one role (time series without roles are not allowed!)",
     "timeseries_id": 2,
diff --git a/tests/test_data.py b/tests/test_data.py
index da4e3acfd73820e8920291e25cb9457bd934f0e9..5dac34c8b27bcfc4f68775df837fbbbf2e7a7662 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -218,8 +218,12 @@ class TestApps:
                                       'roles': [{'id': 2, 'role': 'resource provider', 'status': 'active',
                                                  'contact': {'id': 4, 'organisation': {'id': 1, 'name': 'UBA', 'longname': 'Umweltbundesamt',
                                                                                        'kind': 'government', 'city': 'Dessau-Roßlau', 'postcode': '06844', 'street_address': 'Wörlitzer Platz 1',
-                                                                                       'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}}],
-                                      'citation': 'Umweltbundesamt: time series of toluene at Shangdianzi, accessed from the TOAR database on 2023-07-28 12:00:00'},
+                                                                                       'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}},
+                                                {'id': 3, 'role': 'principal investigator', 'status': 'active',
+                                                 'contact': {'id': 3, 'person': {'email': 's.schroeder@fz-juelich.de','id': 3, 'isprivate': False,
+                                                                                 'name': 'Sabine Schröder', 'orcid': '0000-0002-0309-8010', 'phone': '+49-2461-61-6397'}}}
+                                               ],
+                                      'citation': 'Sabine Schröder: time series of toluene at Shangdianzi, accessed from the TOAR database on 2023-07-28 12:00:00'},
                          'data': [{'datetime': '2012-12-16T21:00:00+00:00', 'value': 21.581, 'flags': 'OK validated verified', 'version': '1.0', 'timeseries_id': 1},
                                   {'datetime': '2012-12-16T22:00:00+00:00', 'value': 13.734, 'flags': 'OK validated verified', 'version': '1.0', 'timeseries_id': 1},
                                   {'datetime': '2012-12-16T23:00:00+00:00', 'value': 13.734, 'flags': 'OK validated verified', 'version': '1.0', 'timeseries_id': 1},
@@ -315,8 +319,18 @@ class TestApps:
                                                                               'street_address': 'Wörlitzer Platz 1',
                                                                               'country': 'Germany',
                                                                               'homepage': 'https://www.umweltbundesamt.de',
-                                                                              'contact_url': 'mailto:immission@uba.de'}}}],
-                                      'citation': 'Umweltbundesamt: time series of toluene at '
+                                                                              'contact_url': 'mailto:immission@uba.de'}}},
+                                                {'id': 3,
+                                                 'role': 'principal investigator',
+                                                 'status': 'active',
+                                                 'contact': {'id': 3,
+                                                             'person': {'email': 's.schroeder@fz-juelich.de',
+                                                                        'id': 3,
+                                                                        'isprivate': False,
+                                                                        'name': 'Sabine Schröder',
+                                                                        'orcid': '0000-0002-0309-8010',
+                                                                        'phone': '+49-2461-61-6397'}}}],
+                                      'citation': 'Sabine Schröder: time series of toluene at '
                                                   'Shangdianzi, accessed from the TOAR database on '
                                                   '2023-07-28 12:00:00',
                                       'license': 'This data is published under a Creative Commons '
@@ -399,8 +413,17 @@ class TestApps:
                                                                               'street_address': 'Wörlitzer Platz 1',
                                                                               'country': 'Germany',
                                                                               'homepage': 'https://www.umweltbundesamt.de',
-                                                                              'contact_url': 'mailto:immission@uba.de'}}}],
-                                      'citation': 'Umweltbundesamt: time series of toluene at '
+                                                                              'contact_url': 'mailto:immission@uba.de'}}},
+                                                {'id': 3,
+                                                 'role': 'principal investigator',
+                                                 'status': 'active',
+                                                 'contact': {'id': 3, 'person': {'email': 's.schroeder@fz-juelich.de',
+                                                                                 'id': 3,
+                                                                                 'isprivate': False,
+                                                                                 'name': 'Sabine Schröder',
+                                                                                 'orcid': '0000-0002-0309-8010',
+                                                                                 'phone': '+49-2461-61-6397'}}}],
+                                      'citation': 'Sabine Schröder: time series of toluene at '
                                                   'Shangdianzi, accessed from the TOAR database on '
                                                   '2023-07-28 12:00:00',
                                       'license': 'This data is published under a Creative Commons '
@@ -505,11 +528,28 @@ class TestApps:
                         '#                    "contact_url": "mailto:immission@uba.de"\n',
                         '#                }\n',
                         '#            }\n',
+                        '#        },\n',
+                        '#        {\n',
+                        '#            "id": 3,\n',
+                        '#            "role": "principal investigator",\n',
+                        '#            "status": "active",\n',
+                        '#            "contact": {\n',
+                        '#                "id": 3,\n',
+                        '#                "person": {\n',
+                        '#                    "id": 3,\n',
+                        '#                    "name": "Sabine Schröder",\n',
+                        '#                    "email": "s.schroeder@fz-juelich.de",\n',
+                        '#                    "phone": "+49-2461-61-6397",\n',
+                        '#                    "orcid": "0000-0002-0309-8010",\n',
+                        '#                    "isprivate": false\n',
+                        '#                },\n',
+                        '#                "organisation": null\n',
+                        '#            }\n',
                         '#        }\n',
                         '#    ],\n',
                         '#    "annotations": null,\n',
                         '#    "changelog": null,\n',
-                        '#    "citation": "Umweltbundesamt: time series of toluene at Shangdianzi, accessed from the TOAR database on 2023-07-28 12:00:00",\n',
+                        '#    "citation": "Sabine Schröder: time series of toluene at Shangdianzi, accessed from the TOAR database on 2023-07-28 12:00:00",\n',
                         '#    "attribution": null,\n',
                         '#    "license": "This data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/"\n',
                         '#}\n',
@@ -638,8 +678,11 @@ class TestApps:
                                       'roles': [{'id': 2, 'role': 'resource provider', 'status': 'active',
                                                  'contact': {'id': 4, 'organisation': {'id': 1, 'name': 'UBA', 'longname': 'Umweltbundesamt',
                                                                                        'kind': 'government', 'city': 'Dessau-Roßlau', 'postcode': '06844', 'street_address': 'Wörlitzer Platz 1',
-                                                                                       'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}}],
-                                      'citation': 'Umweltbundesamt: time series of toluene at Shangdianzi, accessed from the TOAR database on 2023-07-28 12:00:00'},
+                                                                                       'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}},
+                                                {'id': 3, 'role': 'principal investigator', 'status': 'active',
+                                                 'contact': {'id': 3, 'person': {'email': 's.schroeder@fz-juelich.de','id': 3, 'isprivate': False,
+                                                                                 'name': 'Sabine Schröder', 'orcid': '0000-0002-0309-8010', 'phone': '+49-2461-61-6397'}}}],
+                                      'citation': 'Sabine Schröder: time series of toluene at Shangdianzi, accessed from the TOAR database on 2023-07-28 12:00:00'},
                          'data': [{'datetime': '2012-12-16T21:00:00+00:00', 'value': 21.581, 'flags': 'OK validated verified', 'timeseries_id': 1, 'version': '1.0'},
                                   {'datetime': '2012-12-16T22:00:00+00:00', 'value': 13.734, 'flags': 'OK validated verified', 'timeseries_id': 1, 'version': '1.0'},
                                   {'datetime': '2012-12-16T23:00:00+00:00', 'value': 13.734, 'flags': 'OK validated verified', 'timeseries_id': 1, 'version': '1.0'},
@@ -1050,6 +1093,17 @@ class TestApps:
                                                                                   'contact_url': 'mailto:immission@uba.de',
                                                                                  }
                                                                  }
+                                                     },
+                                                     {'id': 3, 'role': 'principal investigator', 'status': 'active',
+                                                      'contact': {'id': 3,
+                                                                  'person': {'email': 's.schroeder@fz-juelich.de',
+                                                                             'id': 3,
+                                                                             'isprivate': False,
+                                                                             'name': 'Sabine Schröder',
+                                                                             'orcid': '0000-0002-0309-8010',
+                                                                             'phone': '+49-2461-61-6397'
+                                                                            }
+                                                                 }
                                                      }],
                                           'changelog': [{'datetime': '',
                                                          'description': 'Sabine Schröder (s.schroeder@fz-juelich.de): test patch bulk data',
@@ -1062,7 +1116,7 @@ class TestApps:
                                                          'period_end': '2012-12-17T04:00:00+00:00',
                                                          'version': '000002.000000.00000000000000'
                                                          }],
-                                          'citation': 'Umweltbundesamt: time series of toluene at Shangdianzi, accessed from the TOAR database',
+                                          'citation': 'Sabine Schröder: time series of toluene at Shangdianzi, accessed from the TOAR database',
                                           'license': 'This data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/',
                                           'doi': ''},
                              'data': [{'datetime': '2012-12-16T21:00:00+00:00', 'value': 21.581, 'flags': 'OK validated verified', 'timeseries_id': 1, 'version': '1.0'},
diff --git a/tests/test_search.py b/tests/test_search.py
index 17b76a7e8a4f08f28de465de539c504d0d6b9ac4..34061821483cdea4dffaeddc96222c719e5ee02d 100644
--- a/tests/test_search.py
+++ b/tests/test_search.py
@@ -262,7 +262,17 @@ class TestApps:
                                                                   'street_address': 'Wörlitzer Platz 1',
                                                                   'country': 'Germany',
                                                                   'homepage': 'https://www.umweltbundesamt.de',
-                                                                  'contact_url': 'mailto:immission@uba.de'}}}]},
+                                                                  'contact_url': 'mailto:immission@uba.de'}}},
+                                    {'id': 3,
+                                     'role': 'principal investigator',
+                                     'status': 'active',
+                                     'contact': {'id': 3,
+                                                 'person': {'email': 's.schroeder@fz-juelich.de',
+                                                            'id': 3,
+                                                            'isprivate': False,
+                                                            'name': 'Sabine Schröder',
+                                                            'orcid': '0000-0002-0309-8010',
+                                                            'phone': '+49-2461-61-6397'}}}]},
                          {'id': 2,
                           'label': 'CMA',
                           'order': 1,
@@ -679,7 +689,12 @@ class TestApps:
         response = client.get("/search/?fields=id,role,order,additional_metadata")
         expected_status_code = 200
         assert response.status_code == expected_status_code
-        expected_resp = [{'id': 1,
+        expected_resp = [{'additional_metadata': {'original_units': 'ppb'},
+                         'id': 1,
+                         'order': 1,
+                         'roles': {'contact_id': 3, 'role': 'principal investigator', 'status': 'active'}
+                         },
+                         {'id': 1,
                           'order': 1,
                           'additional_metadata': {"original_units": "ppb"},
                           'roles': {'role': 'resource provider', 'status': 'active', 'contact_id': 4}
@@ -1093,7 +1108,21 @@ class TestApps:
                                                                       'street_address': 'Wörlitzer Platz 1',
                                                                       'country': 'Germany',
                                                                       'homepage': 'https://www.umweltbundesamt.de',
-                                                                      'contact_url': 'mailto:immission@uba.de'}}}]}]
+                                                                      'contact_url': 'mailto:immission@uba.de'}}},
+                                        {'id': 3,
+                                         'role': 'principal investigator',
+                                         'status': 'active',
+                                         'contact': {'id': 3,
+                                                     'person': {'email': 's.schroeder@fz-juelich.de',
+                                                                'id': 3,
+                                                                'isprivate': False,
+                                                                'name': 'Sabine Schröder',
+                                                                'orcid': '0000-0002-0309-8010',
+                                                                'phone': '+49-2461-61-6397'
+                                                               }
+                                                    }
+                                        }]
+                               }]
         assert response.json() == expected_response
 
 
@@ -1189,5 +1218,19 @@ class TestApps:
                                                                       'street_address': 'Wörlitzer Platz 1',
                                                                       'country': 'Germany',
                                                                       'homepage': 'https://www.umweltbundesamt.de',
-                                                                      'contact_url': 'mailto:immission@uba.de'}}}]}]
+                                                                      'contact_url': 'mailto:immission@uba.de'}}},
+                                        {'id': 3,
+                                         'role': 'principal investigator',
+                                         'status': 'active',
+                                         'contact': {'id': 3,
+                                                     'person': {'email': 's.schroeder@fz-juelich.de',
+                                                                'id': 3,
+                                                                'isprivate': False,
+                                                                'name': 'Sabine Schröder',
+                                                                'orcid': '0000-0002-0309-8010',
+                                                                'phone': '+49-2461-61-6397'
+                                                               }
+                                                    }
+                                        }]
+                               }]
         assert response.json() == expected_response
diff --git a/tests/test_stationmeta.py b/tests/test_stationmeta.py
index c8d86144d3900bc3b85dffa51af934b4f5d37db4..aa5ca570a40661f995b543a8b2966aa8851864f5 100644
--- a/tests/test_stationmeta.py
+++ b/tests/test_stationmeta.py
@@ -1025,3 +1025,15 @@ class TestApps:
         expected_resp = {'detail': 'Station for deleting field not found.'}
         assert response.json() == expected_resp
 
+
+    def test_test(self, client, db):
+        response = client.patch("/stationmeta/SDY54421?description=changing global metadata",
+                json={"stationmeta":
+                          {"globalmeta": { "toar2_category": "Rural"}}
+                          },
+                headers={"email": "s.schroeder@fz-juelich.de"}
+        )
+        expected_status_code = 404
+        assert response.status_code == expected_status_code
+        expected_resp = {'detail': 'Station for patching not found.'}
+        assert response.json() == expected_resp
diff --git a/tests/test_timeseries.py b/tests/test_timeseries.py
index 76c78871d95903a5be36a938990dab38f6a3efcf..5cb98235bda5e6f647830cf68aee266515fe51a2 100644
--- a/tests/test_timeseries.py
+++ b/tests/test_timeseries.py
@@ -69,7 +69,7 @@ class TestApps:
         fake_conn.commit()
         fake_cur.execute("ALTER SEQUENCE timeseries_annotations_id_seq RESTART WITH 1")
         fake_conn.commit()
-        fake_cur.execute("ALTER SEQUENCE timeseries_roles_id_seq RESTART WITH 3")
+        fake_cur.execute("ALTER SEQUENCE timeseries_roles_id_seq RESTART WITH 4")
         fake_conn.commit()
         fake_cur.execute("ALTER SEQUENCE timeseries_programmes_id_seq RESTART WITH 1")
         fake_conn.commit()
@@ -262,7 +262,17 @@ class TestApps:
                                                                   'street_address': 'Wörlitzer Platz 1',
                                                                   'country': 'Germany',
                                                                   'homepage': 'https://www.umweltbundesamt.de',
-                                                                  'contact_url': 'mailto:immission@uba.de'}}}]},
+                                                                  'contact_url': 'mailto:immission@uba.de'}}},
+                                    {'id': 3,
+                                     'role': 'principal investigator',
+                                     'status': 'active',
+                                     'contact': {'id': 3,
+                                                 'person': {'email': 's.schroeder@fz-juelich.de',
+                                                            'id': 3,
+                                                            'isprivate': False,
+                                                            'name': 'Sabine Schröder',
+                                                            'orcid': '0000-0002-0309-8010',
+                                                            'phone': '+49-2461-61-6397'}}}]},
                          {'id': 2,
                           'label': 'CMA',
                           'order': 1,
@@ -386,7 +396,10 @@ class TestApps:
                          'roles': [{'id': 2, 'role': 'resource provider', 'status': 'active',
                                     'contact': {'id': 4, 'organisation': {'id': 1, 'name': 'UBA', 'longname': 'Umweltbundesamt',
                                                                           'kind': 'government', 'city': 'Dessau-Roßlau', 'postcode': '06844', 'street_address': 'Wörlitzer Platz 1',
-                                                                          'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}}],
+                                                                          'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}},
+                                   {'id': 3, 'role': 'principal investigator', 'status': 'active',
+                                    'contact': {'id': 3, 'person': {'email': 's.schroeder@fz-juelich.de', 'id': 3, 'isprivate': False,
+                                                                    'name': 'Sabine Schröder', 'orcid': '0000-0002-0309-8010', 'phone': '+49-2461-61-6397'}}}],
                          'variable': {'name': 'toluene', 'longname': 'toluene', 'displayname': 'Toluene',
                                       'cf_standardname': 'mole_fraction_of_toluene_in_air', 'units': 'nmol mol-1',
                                       'chemical_formula': 'C7H8', 'id': 7},
@@ -610,7 +623,11 @@ class TestApps:
             'roles': [{'id': 2, 'role': 'resource provider', 'status': 'active',
                        'contact': {'id': 4, 'organisation': {'id': 1, 'name': 'UBA', 'longname': 'Umweltbundesamt',
                                                              'kind': 'government', 'city': 'Dessau-Roßlau', 'postcode': '06844', 'street_address': 'Wörlitzer Platz 1',
-                                                             'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}}],
+                                                             'country': 'Germany', 'homepage': 'https://www.umweltbundesamt.de', 'contact_url': 'mailto:immission@uba.de'}}},
+                                  {'id': 3, 'role': 'principal investigator', 'status': 'active',
+                                                           'contact': {'id': 3, 'person': {'email': 's.schroeder@fz-juelich.de','id': 3, 'isprivate': False,
+                                                                                           'name': 'Sabine Schröder', 'orcid': '0000-0002-0309-8010', 'phone': '+49-2461-61-6397'}}}
+                     ],
             'station': {'id': 2, 'codes': ['SDZ54421'], 'name': 'Shangdianzi',
                         'coordinates': {'lat': 40.65, 'lng': 117.106, 'alt': 293.9},
                         'coordinate_validation_status': 'not checked', 'country': 'China',
@@ -776,7 +793,17 @@ class TestApps:
                                                                       'contact_url': 'mailto:immission@uba.de'
                                                                      }
                                                     }
-                                        }
+                                        },
+                                        {'id': 3,
+                                         'role': 'principal investigator',
+                                         'status': 'active',
+                                         'contact': {'id': 3,
+                                                     'person': {'email': 's.schroeder@fz-juelich.de',
+                                                     'id': 3,
+                                                     'isprivate': False,
+                                                     'name': 'Sabine Schröder',
+                                                     'orcid': '0000-0002-0309-8010',
+                                                     'phone': '+49-2461-61-6397'}}}
                                        ]
                              }]
         assert response.json() == expected_response
@@ -986,7 +1013,18 @@ class TestApps:
                               'id': 2,
                               'role': 'resource provider',
                               'status': 'active'
-                             }
+                             },
+                             {'id': 3,
+                              'role': 'principal investigator',
+                              'status': 'active',
+                              'contact': {'id': 3,
+                                          'organisation': None,
+                                          'person': {'email': 's.schroeder@fz-juelich.de',
+                                                     'id': 3,
+                                                     'isprivate': False,
+                                                     'name': 'Sabine Schröder',
+                                                     'orcid': '0000-0002-0309-8010',
+                                                     'phone': '+49-2461-61-6397'}}}
                             ]
         assert response.json() == expected_response
 
@@ -995,7 +1033,7 @@ class TestApps:
         response = client.post("/timeseries/request_contributors?format=text", files={"file": open("tests/fixtures/timeseries/timeseries_id.txt", "rb")})
         expected_status_code = 200
         assert response.status_code == expected_status_code
-        expected_response = 'organisations: Forschungszentrum Jülich;Umweltbundesamt'
+        expected_response = 'organisations: Forschungszentrum Jülich;Umweltbundesamt; persons:Sabine Schröder'
         assert response.json() == expected_response
 
 
@@ -1003,7 +1041,7 @@ class TestApps:
         response = client.post("/timeseries/request_contributors", files={"file": open("tests/fixtures/timeseries/timeseries_id.txt", "rb")})
         expected_status_code = 200
         assert response.status_code == expected_status_code
-        expected_response = 'organisations: Forschungszentrum Jülich;Umweltbundesamt'
+        expected_response = 'organisations: Forschungszentrum Jülich;Umweltbundesamt; persons:Sabine Schröder'
         assert response.json() == expected_response
 
 
@@ -1075,7 +1113,18 @@ class TestApps:
                               'id': 2,
                               'role': 'resource provider',
                               'status': 'active'
-                             }
+                             },
+                             {'id': 3,
+                              'role': 'principal investigator',
+                              'status': 'active',
+                              'contact': {'id': 3,
+                                          'organisation': None,
+                                          'person': {'email': 's.schroeder@fz-juelich.de',
+                                                     'id': 3,
+                                                     'isprivate': False,
+                                                     'name': 'Sabine Schröder',
+                                                     'orcid': '0000-0002-0309-8010',
+                                                     'phone': '+49-2461-61-6397'}}}
                             ]
         assert response.json() == expected_response
 
@@ -1084,7 +1133,7 @@ class TestApps:
         response = client.get("/timeseries/request_timeseries_list_of_contributors/7f0df73a-bd0f-48b9-bb17-d5cd36f89598?format=text")
         expected_status_code = 200
         assert response.status_code == expected_status_code
-        expected_response = 'organisations: Forschungszentrum Jülich;Umweltbundesamt'
+        expected_response = 'organisations: Forschungszentrum Jülich;Umweltbundesamt; persons:Sabine Schröder'
         assert response.json() == expected_response
 
 
@@ -1223,12 +1272,22 @@ class TestApps:
                                                         'contact_url': 'mailto:immission@uba.de'}},
                            'id': 2,
                            'role': 'resource provider',
-                           'status': 'active'}]
+                           'status': 'active'},
+                          {'id': 3,
+                           'role': 'principal investigator',
+                           'status': 'active',
+                           'contact': {'id': 3,
+                                       'person': {'email': 's.schroeder@fz-juelich.de',
+                                                  'id': 3,
+                                                  'isprivate': False,
+                                                  'name': 'Sabine Schröder',
+                                                  'orcid': '0000-0002-0309-8010',
+                                                  'phone': '+49-2461-61-6397'}}}]
         set_expected_response_roles = {json.dumps(item, sort_keys=True) for item in response_roles}
         set_response_roles = {json.dumps(item, sort_keys=True) for item in response_json['roles']}
         assert set_response_roles == set_expected_response_roles
-        assert response_json['changelog'][0]['old_value'] == "{'roles': [{'role': 'ResourceProvider', 'status': 'Active', 'contact_id': 4}]}"
-        assert response_json['changelog'][0]['new_value'] == "{'roles': [{'role': 'ResourceProvider', 'status': 'Active', 'contact_id': 4}, {'role': 'ResourceProvider', 'contact_id': 5, 'status': 'Active'}]}"
+        assert response_json['changelog'][0]['old_value'] == "{'roles': [{'role': 'ResourceProvider', 'status': 'Active', 'contact_id': 4}, {'role': 'PrincipalInvestigator', 'status': 'Active', 'contact_id': 3}]}"
+        assert response_json['changelog'][0]['new_value'] == "{'roles': [{'role': 'ResourceProvider', 'status': 'Active', 'contact_id': 4}, {'role': 'PrincipalInvestigator', 'status': 'Active', 'contact_id': 3}, {'role': 'ResourceProvider', 'contact_id': 5, 'status': 'Active'}]}"
         assert response_json['changelog'][0]['author_id'] == 1
         assert response_json['changelog'][0]['type_of_change'] == 'single value correction in metadata'