X'A044' QMR50 - UNLOAD - ERROR GET/REL DFSBCB STORAGE

Explanation
 A DFSBCB call received a nonzero return code while
trying to get or release storage from the storage pool for a work
area.

Programmer response
 R15 is the return code from the DFSBCB
call. This is either an internal IMS error
or insufficient storage is available in the control region private
area.