Altering the location of Oracle-Suggested Backup

Question

On one database, the Oracle-Suggested Backup scheduled from Enterprise Manager always ends up in the recovery area, despite RMAN configuration showing that device type disk format points elsewhere.

As far as I can see, the scheduled backup job is simply:

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;
}

Asking RMAN to show all reveals that device type disk is indeed configured to store elsewhere:

CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT   '/s01/backup/PROD11/PROD11_%U';

If I run the script manually, the backupset is placed at the above location, when the script is run from the job scheduler the backupset goes to the RECO group on ASM,

Why might Oracle still choose to dump the backupset to the db_recovery_file_dest?

Ultimately, how can I change the backup destination?