diff --git a/src/server/BreCal/api/times.py b/src/server/BreCal/api/times.py
index 23537bd..a22eabb 100644
--- a/src/server/BreCal/api/times.py
+++ b/src/server/BreCal/api/times.py
@@ -72,7 +72,7 @@ def PutTimes():
 
         # validate the request
         InputValidationTimes.evaluate_put_data(user_data, loadedModel, content)
-        return impl.times.PutTimes(loadedModel)
+        return impl.times.PutTimes(loadedModel, content)
 
     except ValidationError as ex:
         return create_validation_error_response(ex=ex, status_code=400)
diff --git a/src/server/BreCal/impl/times.py b/src/server/BreCal/impl/times.py
index c7f99bc..32496bb 100644
--- a/src/server/BreCal/impl/times.py
+++ b/src/server/BreCal/impl/times.py
@@ -115,7 +115,7 @@ def PostTimes(schemaModel):
             pooledConnection.close()
 
 
-def PutTimes(schemaModel):
+def PutTimes(schemaModel, original_payload=None):
     """
 
     :param schemaModel: The deserialized model of the record to be inserted
@@ -127,24 +127,33 @@ def PutTimes(schemaModel):
         pooledConnection = local_db.getPoolConnection()
         commands = pydapper.using(pooledConnection)
 
-        query = "UPDATE times SET "
-        isNotFirst = False
+        sentinel = object()
+        existing_times = commands.query_single_or_default("SELECT * FROM times WHERE id = ?id?", sentinel, param={"id": schemaModel["id"]})
+        if existing_times is sentinel:
+            return json.dumps("no such record"), 404, {'Content-Type': 'application/json; charset=utf-8'}
+
+        provided_keys = set(original_payload.keys()) if isinstance(original_payload, dict) else None
+
+        if "shipcall_id" not in schemaModel or (provided_keys is not None and "shipcall_id" not in provided_keys):
+            schemaModel["shipcall_id"] = existing_times["shipcall_id"]
+
+        schemaModel = {k:v.value if isinstance(v, (Enum, Flag)) else v for k,v in schemaModel.items()}
+
+        update_clauses = []
         for key in schemaModel.keys():
+            if provided_keys is not None and key not in provided_keys:
+                continue
             if key == "id":
                 continue
             if key == "created":
                 continue
             if key == "modified":
                 continue
-            if isNotFirst:
-                 query += ", "
-            isNotFirst = True
-            query += key + " = ?" + key + "? "
+            update_clauses.append(f"{key} = ?{key}?")
 
-        query += "WHERE id = ?id?"
-
-        schemaModel = {k:v.value if isinstance(v, (Enum, Flag)) else v for k,v in schemaModel.items()}
-        affected_rows = commands.execute(query, param=schemaModel)
+        if update_clauses:
+            query = "UPDATE times SET " + ", ".join(update_clauses) + " WHERE id = ?id?"
+            commands.execute(query, param=schemaModel)
 
         # apply 'Traffic Light' evaluation to obtain 'GREEN', 'YELLOW' or 'RED' evaluation state. The function internally updates the mysql database 'shipcall'
         evaluate_shipcall_state(mysql_connector_instance=pooledConnection, shipcall_id=schemaModel["shipcall_id"]) # every times data object refers to the 'shipcall_id'