What is the difference between msg 3525 and 2546 issued in backup/archive jobs

Document ID : KB000057546
Last Modified Date : 14/02/2018
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A weekly backup job ended with two different return codes for the same data set.
One week, the job had this message: 3525 and ended with RC=04.
The next week, the job had this message: 2546 and ended with RC=08.
We do not understand why the message text was different for the same dataset.
Can you explain, please?
The differences in the two runs is this:

M3525 - No data sets were selected during DSCL selection.
The only data sets found are cataloged to the CA Disk pseudo-volume.

M2546 - There were no entries found in the catalog, not even
pseudo-vol entries for ARCIVEd data sets.

For the M3525, these is a Sysparm that you could specify:

N – (Default) Cond. Code not reduced.
Y - If a FIND command can locate no data sets to process (M3525), CC 4 is reduced to a 0.

Additional Information:
See Sysparms CCDRESET and SMSLOWRC for other options to affect return codes.