DFSMSrmm is called at cartridge entry time by the CBRUXENT installation exit which DFSMSrmm supplies. During cartridge entry processing in an automated tape library, the installation exit passes the external volume serial number. DFSMSrmm checks for the existence of a volume or a rack with the same number. When there is a conflict, the cartridge entry is denied. DFSMSrmm sets a return code telling OAM not to process the volume on this system under these conditions.

• If a volume is defined to DFSMSrmm as "not for use on z/OS".
• If a volume is not defined to DFSMSrmm and it matches the REJECT ANYUSE prefixes, and is entered into a tape library. If you use REJECT commands, you have to convert from the use of REJECT commands in order to use the PRTITION and OPENRULE commands. See Converting REJECT commands to PRTITION and OPENRULE commands for information about converting from the use of REJECT commands.