DYNUTIL pool backup error

Document ID : KB000112406
Last Modified Date : 29/08/2018
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Issue:
Attempting to back up a dynam pool as shown below. Indicates a duplicate file, however searching all VTOCs in the system there is no duplicate file, only one which matches the Dynam catalog entry. 

// TLBL DUMP,'BKUP.LARG04',,,,,,01 SYS005 
// EXEC DYNUTIL,SIZE=300K 
1S54I PHASE DYNUTIL IS TO BE FETCHED FROM VENDOR.DYNAM71 
CA D Y N A M / D D I S K M A I N T E N A N 
CA DYNAM 7.1 0809YD000 

DUMP '*' POOL=LARG04 
CADD546E DUPLICATE COPIES OF FILE-ID HAVE BEEN FOUND 'MCC384L BACKUP G#16' 
CADD562E FUNCTION ABNORMALLY TERMINATED, RETURN-CODE 008 
CADD563I END OF DYNUTIL PROCESSING. MAX.RETURN CODE=0008 
1S55I LAST RETURN CODE WAS 0008
 
Resolution:
For LARG04, your CAISERV shows:

CADS000I COMPOOL (PRL031,,) (PRL032,,) (PRL033,,) (PRL034,,) (PRL035,,) 
CADS000I (PRL034,,) (PRL035,,) (PRL036,,) (PRL037,,) PARTID=ALL 
CADS000I ROTATE=YES CLASS=ALL VOLSER=LARG04 

Both PRL034 and PRL035 are duplicates and must be removed. 
CUI isn't going to show anything more than the CAISERV already shows. 

So, to solve this, you need to remove duplicates PRL034 and PRL035.