SSTS Blog
Some news and tidbits that we share
On occasion I have had to move rman backup pieces around due to disk space shortages, etc. In order to avoid complexities if a restore is required you should re-"register" these backup pieces with rman so that it knows where they are. The CATALOG BACKUPPIECE command serves this purpose.
syntax:
CATALOG BACKUPPIECE '/path_to_backup_piece/filename1', '/path_to_backup_piece/filename2', ...
After you are done you should follow up with a crosscheck backup command.