Received message 4183I INVALID LOGICAL UNIT OUTONE SYS005 trying to mount scratch tape for backup

Document ID : KB000117498
Last Modified Date : 12/10/2018
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Issue:
Message 4183I INVALID LOGICAL UNIT OUTONE SYS005 occurred while trying to mount a scratch tape for a backup.
Environment:
We had a production payroll job that ran fine the other day but failed this morning with the following error: 

F9 0009 4183I INVALID LOGICAL UNIT OUTONE SYS005  
F9 0009 0V15I REQUEST FROM SYSTEM SERVICE ROUTINE  
F9 0009 0S00I JOB VOUCHER2 CANCELED

This was generated by the following JCL: 

// DLBL INONE,'PAYROLL.TRANS',,VSAM 
// TLBL OUTONE,'PRODVSE.TRANS.BKUP' 
// DLBL INTWO,'T8.PENSION',,VSAM,CAT=PRODTWO 
// TLBL OUTTWO,'PRODVSE.T8.PENSION' 
// EXEC IDCAMS,SIZE=AUTO 
REPRO - 


 
Resolution:
Customer solved the problem by setting DYNAMT=ON and received the proper assignment.
 
Additional Information:
We were able to run in another partition without a problem and were planning to IPL this evening to fix the problem when I was able to reproduce the problem in our sandbox VSE by simply setting DYNAMT=OFF in the partition.

By setting DYNAMT=ON back on again we received the proper assignment. So somewhere in our production VSE system DYNAMT=OFF was issued in our F9 partition.