Data Protection gateway Server policy exception

Document ID : KB000115143
Last Modified Date : 17/09/2018
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Issue:
After re-installing a PE server on a CA Data Protection Gateway errors similar to the ones below start to appear in the activity log.

Sep 13, 2018 04:32:57 AM NT AUTHORITY\SYSTEM E0928 The server failed during initialization/policy update. Exception was 'Obtained unexpected value from policy'.
Sep 13, 2018 04:32:59 AM NT AUTHORITY\SYSTEM I0917 Loaded policy 'UserMaster/UnknownInternalSender', version 2.4932.1.
Environment:
CA Data Protection 15.0 Gateway Server with Policy Engine server parented to another Gateway.
Cause:
This is caused by a a mismatch in the expected and actual policy ID numbers
Resolution:
Parenting the Gateway server directly with the CMS forces the Gateway to resync all objects and this addresses the problem.