Not all authorizations for object &1 could be deleted

What causes this issue?

There are authorizations for the authorization object &v1& that were not
created with transaction RSSM. These cannot be deleted automatically
.
Authorizations created with transaction RSSM have been deleted.

System Response

You can only delete the authorization object &v1& once you also deleted
the other authorizations manually.

How to fix this error?

First delete existing roles (and profiles) for authorization object &v1&
.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.