diff --git a/sync/models/sync_project_demo.py b/sync/models/sync_project_demo.py
index 4211e81c..68104c5c 100644
--- a/sync/models/sync_project_demo.py
+++ b/sync/models/sync_project_demo.py
@@ -60,8 +60,8 @@ def odoo_execute_kw(model, method, *args, **kwargs):
                     params.DB, secrets.USERNAME, secrets.PASSWORD, {}
                 )
                 models = _client.ServerProxy("{}/xmlrpc/2/object".format(params.URL))
-            except OSError:
-                raise RetryableJobError("Error on connecting to external Odoo")
+            except OSError as err:
+                raise RetryableJobError("Error on connecting to external Odoo") from err
             res = models.execute_kw(
                 params.DB, uid, secrets.PASSWORD, model, method, args, kwargs
             )
diff --git a/sync/tests/test_links.py b/sync/tests/test_links.py
index aa437fda..f11ca733 100644
--- a/sync/tests/test_links.py
+++ b/sync/tests/test_links.py
@@ -180,10 +180,10 @@ def test_external_link(self):
 
         # one2many
         self.set_link(REL, {"github": 5, "trello": 105})
-        with self.assertRaises(Exception):
+        with self.assertRaises(ValidationError):
             self.set_link(REL, {"github": 5, "trello": 1005})
         self.set_link(REL, {"github": 5, "trello": 1005}, allow_many2many=True)
-        with self.assertRaises(Exception):
+        with self.assertRaises(ValidationError):
             glink = self.get_link(REL, {"github": 5, "trello": None})
         glinks = self.search_links(REL, {"github": 5, "trello": None})
         self.assertEqual(2, len(glinks))