Because OAM has no knowledge of whether a volume contains user data and because volumes may be entered incorrectly as PRIVATE when they are really SCRATCH, OAM does not prevent changing a WORM volume from PRIVATE to SCRATCH (for either physical or logical WORM). Also, when you invoke the CBRUXCUA installation exit, a UXCVWORM indicator in the CBRUXCPL parameter list is set on when the volume is a physical WORM tape to alert the tape management system that the CUA function is being performed for a WORM volume. Because a logical WORM volume is not distinguishable by a unique media type, the UXCVWORM indicator is not turned on for a logical WORM volume. If this information is needed, the CBRUXCUA installation exit can invoke the CBRXLCS FUNC=QVR interface to obtain this information from the library.