diff --git a/sync/views.py b/sync/views.py
index f97ee2e..b83eff7 100644
--- a/sync/views.py
+++ b/sync/views.py
@@ -2,7 +2,6 @@
 import re
 import json
 from .serializers import DataAccessSerializer
-from django.db.models import Q
 
 from rest_framework import viewsets
 from rest_framework.views import APIView
@@ -10,9 +9,10 @@ from rest_framework.permissions import IsAuthenticated
 from rest_framework.response import Response
 from rest_framework import status
 
-# from django.apps import apps
 from django.utils import timezone
 from django.core.exceptions import ObjectDoesNotExist
+from django.db import transaction
+from django.db.models import Q
 
 from collections import defaultdict
 from urllib.parse import unquote
@@ -101,12 +101,11 @@ class SynchronizationApi(HierarchyApiView):
         for op in operations:
             result = None
             message = None
+            model_operation = op.get('operation')
+            model_name = op.get('model_name')
+            data = op.get('data')
             try:
-                model_operation = op.get('operation')
-                model_name = op.get('model_name')
-                data = op.get('data')
-
-                print(f'{model_operation} : {model_name}')
+                print(f'{model_operation} : {model_name}, id = {data['id']}')
 
                 models.add(model_name)
 
@@ -148,19 +147,19 @@ class SynchronizationApi(HierarchyApiView):
                     try:
                         instance = get_data(model_name, data_id)
                         instance._device_id = device_id
-                        instance.delete()
-                        response_status = status.HTTP_204_NO_CONTENT
-                    except model.DoesNotExist: # POST
+
+                        try:
+                            instance.delete()
+                            response_status = status.HTTP_204_NO_CONTENT
+                        except model.DoesNotExist: # a relationship was not found, not good
+                            response_status = status.HTTP_400_BAD_REQUEST
+                    except model.DoesNotExist: # the data was not found, it's ok
                         response_status = status.HTTP_208_ALREADY_REPORTED
-                        # delete = ModelLog.objects.filter(model_id=data_id, operation=model_operation).first()
-                        # if delete:
-                        #     response_status = status.HTTP_208_ALREADY_REPORTED
-                        # else:
-                        #     response_status = status.HTTP_404_NOT_FOUND
+                        print(f'{model_name} DoesNotExist, id: {data_id}')
 
             except Exception as e:
                 response_status = status.HTTP_400_BAD_REQUEST
-                print(f'other exception: {str(e)}, type: {type(e)}, args: {e.args}, traceback: {e.__traceback__}')
+                print(f'OTHER exception on {model_operation} {model_name} : {str(e)}, type: {type(e)}, id: {data.get('id')}')
                 message = str(e)
 
             results.append({