SAP verify a successful backup by doing a bplist for each file. If bplist fails for a single file, the entire backup fails.
Check for the following:
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Verify the right client is listed in initSID.sap
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Verify the right client is listed in initSID.utl
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verify no local bp.conf is present in e.g /oracle/SID/bp.conf
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Verify environment variables are configured correct.
For additional debug add a directory called backint in /usr/openv/netbackup/logs and do a chmod 777 on the backint directory so SAP can log information into the directory.
In you're case there may be a misspelled client name somewhere. The backint log should show what names are used.