CMMNW5143E The fileset
cannot be deleted. It is referenced by the current active policy set.
Explanation
You cannot detach the fileset because clients are currently
accessing data within the fileset.
Action
Perform one of these actions to resolve the problem:
Wait until clients are no longer accessing files in the fileset
before attempting to detach it.
Force the detachment of the fileset.
Note that if you force the detachment of the fileset,
the files and directories in the fileset will be deleted,
even those currently being accessed.