...
>I checked *ALL* messages manuals that I have, including the 5.2 book...
...

The manuals suffered from the translation from the original Klingon
when Tivoli took over the product.  :-)
The messages are explained in the B/A Clients manual, under topic
"Displaying backup processing status".  They were added to the manual
after I requested some explanation of the messages be added, given
that they were so common as output from CLI backups and yet not
explained anywhere.  Refer your users to that doc.

  Richard Sims, BU