---
title: Restrictions
description: Review the restrictions for Kafka sync destinations, including a Ping Identity sync source, enabled changelog, and notification mode.
component: pingdirectory
version: 10.3
page_id: pingdirectory:pingdatasync_server_administration_guide:pd_sync_restrictions
canonical_url: https://docs.pingidentity.com/pingdirectory/11.1/pingdatasync_server_administration_guide/pd_sync_restrictions.html
llms_txt: https://docs.pingidentity.com/pingdirectory/llms.txt
docs_for_agents: https://developer.pingidentity.com/build-with-ai/docs-for-agents.md
revdate: 2023-09-13T00:00:00Z
superseded_by: https://docs.pingidentity.com/pingdirectory/11.1/pingdatasync_server_administration_guide/pd_sync_restrictions.html
---

# Restrictions

The following restrictions affect the manner in which a Kafka sync destination is used:

* The sync source must be a Ping Identity sync source.

* The `changelog` backend must be enabled on all instances of the PingDirectory server.

* To ensure the availability of an entry's attributes from before and after a change, the configuration property `changelog-include-key-attribute` must include `'*'`.

* The Sync Pipe must be configured in Notification mode (`synchronization-mode:notification`) because a Kafka sync destination cannot retrieve the current version of a destination entry.