What is ACM?
The Modify Identity permission enables the Rename action for users - allowing editing of Number, Name and (for CAD Doc only) filename. The Modify Identity action is on the master, affecting all Versions The permission must be granted for each state in the object's Version history.
If a user has Modify Identity permission for In Work but not for Released and they attempt to rename / renumber an object at B.2 that has A.3 at Released, it will fail.