0x00851022 (8720418) An error occurred while trying to obtain a dequeue (DEQ) on a shared memory object.

Explanation
 The ISGENQ macro failed while trying to obtain
a dequeue (DEQ) on a shared memory object. The return and reason codes
for this error are displayed in the data fields in the server log
entry.

User response
To obtain a description of the error and determine
a corrective action, refer to the return and reason codes for the
macro ISGENQ in the MVS Programming Assembler Services Reference.