If the storage range you specify is already assigned to a subspace, the system does not process that request but will continue to process the subsequent valid range list entries. The system places return code 4 in GPR 0.

If an entry in the range list does not conform to one or more of the range list requirements, the system processes the range list entries up to the entry in error. The system does not process the incorrect range list entry or any range list entries that follow it. The system abnormally ends the IARSUBSP ASSIGN request with system completion code X'3C6', and puts the address of the incorrect range list entry in GPR 2. It puts the address of the storage range into GPR 3.