Your server program should run under the lowest task in the task hierarchy that will need to make storage eligible to be assigned to a subspace.

The first time a server program successfully issues the IARSUBSP IDENTIFY request in an address space, the system identifies the task under which that program runs as the lowest task in the task hierarchy that can make subsequent IARSUBSP IDENTIFY requests. Additionally, that task or a higher task must own the storage that is being made eligible to be assigned to a subspace.