You can see one of the following entry in SM21:
GE 8 "Enqueue: elementary lock 0 has invalid lock mode 'X'; lock object ENQARRAY"
GE 8 "Enqueue: Elem.lock 0 contains unpermitted lock mode 'X'. Lock object ENQARRAY"
You're using SAP Travel Management application
FORM Dequeue, LPTRM_WEB_TRIPSF04, PTRM_WEB_TRIPS , KBA , BC-CST-EQ , Enqueue , Problem
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