Reason:
This message appears only on the z/VSE console. It is written without a #WTL using text from within the program itself.
An attempt has been made to assign a programmer logical unit (SYSNO) to a tape unit, but there are no free tape units available. A tape file is being opened for which no SYSNO was provided. When RHDCDFIO tried to assign a SYSNO to a drive, it found no drives available. DVCUP a tape unit for this job or wait until a tape unit is released by another job, and reply RETRY to message DC519601. If no tapes can be made available, reply CANCEL to cancel the job.
Module:
RHDCDFIO
Severity:
0
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