Diagnosis
The migration is only run up to the deletion process. This means thatold migration processes are deleted without generating new migrations.
To actually undo all old migrations, you can select all users and allauthorization objects.
However, specific deletion processes can be selected. However, the sameconditions are required as with the normal migration process. This meansthat only complete user groups can be selected and authorizationobjects must be selected.
Complete means that the migrated authorization profiles can onlybe present in users that are to be migrated and not in other users.Completeness also depends on the selection of authorization objects theauthorizations of which are to be migrated. If affected profiles arepresent in other users that are not in the selection list, an errormessage is displayed with the list of missing users and the process isterminated (a message appears in the log in any case).

Procedure
If you want to delete everything, choose a user and all authorizationobjects to be recalled ("undo").