Hi I had a similar experience with TDP for mySAP using DB2 ver 8.2 AIX and
landed up being able to use the files by restoring the backupset to disk, then
renaming the restored backup image to the format that DB/2 expects it to be in
(TSM has its own naming scheme which must get translated by Data Protector)

I could then do a standard DB/2 restore from the disk file without any problems,
Note:

To get the file name correct I created and empty DB ie create db testing and
backed it up to disk then renamed my backupset file to match its name structure.

Chris