diff --git a/packages/cultmesh-py/tests/test_cultmesh.py b/packages/cultmesh-py/tests/test_cultmesh.py
index fa821086..b49b6ed9 100644
--- a/packages/cultmesh-py/tests/test_cultmesh.py
+++ b/packages/cultmesh-py/tests/test_cultmesh.py
@@ -4884,6 +4884,7 @@ class CultMeshTests(unittest.TestCase):
             self.assertEqual(refusal["schemaVersion"], "cultnet.error.v0", message_id)
             self.assertEqual(refusal["messageId"], message_id)
             self.assertEqual(refusal["code"], "message_invalid", message_id)
+            self.assertEqual(refusal["details"]["field"], "document", message_id)
         self.assertEqual(after["messageId"], "after")
         self.assertEqual(after["documents"], [])
         self.assertTrue(alive)
@@ -4943,6 +4944,7 @@ class CultMeshTests(unittest.TestCase):
             self.assertEqual(refusal["schemaVersion"], "cultnet.error.v0", message_id)
             self.assertEqual(refusal["messageId"], message_id)
             self.assertEqual(refusal["code"], "message_invalid", message_id)
+            self.assertEqual(refusal["details"]["field"], "document", message_id)
             self.assertNotIn("note:ok", refusal["error"], message_id)
         self.assertEqual(len(tcp_refusals), 5)
         self.assertEqual(rudp_after["schemaVersion"], "cultnet.hello.v0")