In both cases the mount request is for a specific labeled tape volume. When the error is for a label, two specific mount requests have previously been issued for the volume specified by ser.
The job step waits for the operator to reply or until the task reaches the maximum time limit.
Reply M for open or EOV processing to continue to process the mounted volume. If another data check or label error is detected, this may result in a volume demount followed by another MOUNT request for the volume specified by ser.
Reply A to abend the task, abend X'413' with a return code of X'OC' for OPEN processing, abend X'637' with a return code of X'34' for EOV processing. The abend option provides an alternative to cancelling the job when the specific labeled tape mount request cannot be satisfied.
Data Facility Product (DFP)