The storage ranges supplied in the range list for an IARSUBSP UNIDENTIFY request must meet the requirements described in Requirements of the range list for an IDENTIFY or UNIDENTIFY request. In addition, the storage range must be eligible to be assigned to a subspace.

If an entry in the range list does not conform to one or more of these 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 UNIDENTIFY 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.