X'2018' PURGE NON 0 RC ON QMGR ENQ CALL
Explanation
The message is being purged (enqueued to a temporary destination), and a nonzero return code was received from the message queue manager on the enqueue call.
Programmer response
The message queue manager return code is in REG15 of the REG14-12 save area. The message queue buffer is in the QMBA area. This is probably an internal IMS error.