What causes this issue?

The affected compliance object could not be deleted.
The reasons for this could be very different; thererfore, the report
does not provide them.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Execute the report again, in case the compliance object only was locked.
Let the objects undeleted or get in contact with an developer.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.