diff --git a/src/server/BreCal/impl/shipcalls.py b/src/server/BreCal/impl/shipcalls.py
index 587e321..55a98c1 100644
--- a/src/server/BreCal/impl/shipcalls.py
+++ b/src/server/BreCal/impl/shipcalls.py
@@ -108,6 +108,14 @@ def PutShipcalls(schemaModel):
         pooledConnection = local_db.getPoolConnection()
         commands = pydapper.using(pooledConnection)
 
+        # test if object to update is found
+
+        sentinel = object()
+        theshipcall = commands.query_single_or_default("SELECT * FROM shipcall where id = ?id?", sentinel, param={"id" : schemaModel["id"]})
+        if theshipcall is sentinel:
+            pooledConnection.close()
+            return json.dumps("no such record"), 404, {'Content-Type': 'application/json; charset=utf-8'}
+
         query = "UPDATE shipcall SET "
         isNotFirst = False
         for key in schemaModel.keys():
@@ -124,19 +132,34 @@ def PutShipcalls(schemaModel):
         affected_rows = commands.execute(query, param=schemaModel)
 
         pquery = "SELECT id, participant_id FROM shipcall_participant_map where shipcall_id = ?id?"
-        pdata = commands.query(pquery,param={"id" : schemaModel.id})
+        pdata = commands.query(pquery,param={"id" : schemaModel["id"]}) # existing list of assignments
 
         # loop across passed participant ids, creating entries for those not present in pdata
 
+        for participant_id in schemaModel["participants"]:
+            found_participant = False
+            for elem in pdata:
+                if elem["participant_id"] == participant_id:
+                    found_participant = True
+                    break
+            if not found_participant:
+                nquery = "INSERT INTO shipcall_participant_map (shipcall_id, participant_id) VALUES (?shipcall_id?, ?participant_id?)"
+                commands.execute(nquery, param={"shipcall_id" : schemaModel["id"], "participant_id" : participant_id})
+
         # loop across existing pdata entries, deleting those not present in participant list
-        
+        for elem in pdata:
+            found_participant = False
+            for participant_id in schemaModel["participants"]:
+                if(participant_id == elem["participant_id"]):
+                    found_participant = True
+                    break;
+            if not found_participant:
+                dquery = "DELETE FROM shipcall_participant_map WHERE id = ?existing_id?"
+                commands.execute(dquery, param={"existing_id" : elem["id"]})
 
         pooledConnection.close()
 
-        if affected_rows == 1:
-            return json.dumps({"id" : schemaModel["id"]}), 200
-
-        return json.dumps("no such record"), 404, {'Content-Type': 'application/json; charset=utf-8'}
+        return json.dumps({"id" : schemaModel["id"]}), 200
 
     except Exception as ex:
         logging.error(ex)