Hi Paul

Well logically speaking it shouldnt matter much since under the covers those fancy GUI widgets again call RMAN.

What i would like to try is this manually and see what happens

Code:
RMAN>DELETE NOPROMPT OBSOLETE EXPIRED BACKUP
RMAN>DELETE NOPROMPT OBSOLETE EXPIRED ARCHIVELOG ALL
RMAN>DELETE NOPROMPT OBSOLETE EXPIRED COPY

run {
allocate channel oem_disk_backup device type disk;
recover copy of database with tag 'ORA\$OEM_LEVEL_0';
backup incremental level 1 cumulative copies=1 for recover of copy with tag 'ORA\$OEM_LEVEL_0' database;
}
regards
Hrishy