After the server program has obtained storage, it must make the storage eligible to be assigned to a subspace. To do this, invoke the IARSUBSP macro with the IDENTIFY parameter, specifying the storage range.

A program that is running in a subspace cannot reference a range of storage once the storage range is eligible to be assigned to a subspace. If it attempts to do so, it will abnormally end with system completion code X'0C4'. In addition, the server program cannot pass ownership of this subspace-eligible storage to a subtask. If the server program attempts to do so by invoking the ATTACH macro with either the GSPL or GSPV parameter, the system will abnormally end the server program with system completion code X'12A'.

A server program that attempts to release the storage before the storage has been made ineligible to be assigned to a subspace will abnormally end with system completion code X'A05', X'A0A', or X'A78'. To make the storage ineligible to be assigned to a subspace, specify the storage range on the IARSUBSP macro with the UNIDENTIFY parameter.