What causes this issue?

At least one of the ACP entries for a compliance object could not be
deleted.
The reasons for this could be very different; thererfoe, 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?

Let the objects undeleted or get in contact with an developer.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.