Why does my archivelog RMAN backups end up in ORACLE_HOME/dbs ?

Question

DB version: 11.2
Platform: Solaris 10
I have noticed that , rman backup pieces containing archivelogs end up in $ORACLE_HOME/dbs directory despite using format parameter. This happened for both Level 0 AND Level 1 backups.
I know that backup files end up in $ORACLE_HOME/dbs when you forget to specify FORMAT. But FORMAT is included in my Level0 and Level 1 Scripts as shown below. Is there anything else wrong with my L0 and L1 scripts ?
Following are my Level0 and Level 1 backup scripts
-- Level0
run
allocate channel LEVEL0_TBLQA device type disk;
crosscheck backup;
delete noprompt obsolete;
backup as backupset incremental level 0 database format='/u04/dbfiles/RMAN_bkp/tblqa/TBLQA_full_%U_%T.bkp' plus archivelog delete input;
release channel LEVEL0_TBLQA;
}--- Level 1
run {
backup as compressed backupset incremental level 1 database format='/u04/dbfiles/RMAN_bkp/tblqa/TBLQA_L1_%U_%T.bkp' plus archivelog delete all input;
}This DB is using control file as catalog.

Answer 1

backup as backupset incremental level 0 database format='/u04/dbfiles/RMAN_bkp/tblqa/TBLQA_full_%U_%T.bkp' plus archivelog delete input;
backup as compressed backupset incremental level 1 database format='/u04/dbfiles/RMAN_bkp/tblqa/TBLQA_L1_%U_%T.bkp' plus archivelog delete all input;This is because, the format you have specified stands good only till the backup of database (backup as compressed backupset incremental level 1 database format ".....") and not for the archive log in your script. Hence, the archivelog backups get stored in the $ORACLE_HOME/dbs location and the database backup gets stored in the format location you have mentioned in your RMAN script.
Instead you can use as below:
run
allocate channel LEVEL0_TBLQA device type disk format '/u04/dbfiles/RMAN_bkp/tblqa/TBLQA_full_%U_%T.bkp';
crosscheck backup;
delete noprompt obsolete;
backup as backupset incremental level 0 database plus archivelog delete input;
release channel LEVEL0_TBLQA;