Interesting.... Its's on p.10 of the pdf doc:
ftp://exftpp.symantec.com/pub/support/products/NetBackup_Enterprise_Server/337179.pdf
If you upgrade from a previous version of NetBackup and currently have a olume pool named CatalogBackup, a volume pool name conflict can occur.
Before the upgrade, users should do the following in the previous version of NetBackup:
■ Create a new volume pool.
■ Move the media that is currently in the CatalogBackup volume pool into the new volume pool.
■ Delete the CatalogBackup volume pool.
The installation portion of the upgrade process creates a new default volume pool titled CatalogBackup.
Seems this note was taken AS IS from the 6.5 Add Operational Notes p.13.
ftp://exftpp.symantec.com/pub/support/products/NetBackup_Enterprise_Server/288211.pdf
It was possible to upgrade from 5.1 where there were no hot catalog backups and no default CatalogBackup pool.
I would say you can safely ignore this section..........