Error While Delete User from Server Console

Document ID : KB000007598
Last Modified Date : 14/02/2018
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Issue:

We are not able to delete any users from the DevTest Server Console . We are getting error "Error Deleting the User".

Environment:
DevTest 9.0.0
Cause:

The problem was caused by the constraint FK_USER_PREFERENCE1 on the Registry Database.

Resolution:

You will need to open a support case to get the needed patch.  Reference DE256094.