RMAN %N Format Backup

Question

Hi Gurus,
I have rman script that backups up my 10g database. I'm trying to format the backup ser as databasename_tablespaceName_date_UniqueNo.dbf. This is my script:
backup incremental level 1
filesperset 1
format '%d_%N_%T'
keep until time "sysdate+1" logs
(database include current controlfile);
All datafiles complete but at the end I get this error:
ORA-19715: invalid format N for generated name
ORA-27302: failure occurred at: slgpn
continuing other job steps, job failed will not be re-run
channel ch2: starting incremental level 1 datafile backupset
channel ch2: specifying datafile(s) in backupset
including current SPFILE in backupset
channel ch2: starting piece 1 at 27-AUG-09
RMAN-03009: failure of backup command on ch2 channel at 08/27/2009 07:45:01
ORA-19715: invalid format N for generated name
ORA-27302: failure occurred at: slgpn
continuing other job steps, job failed will not be re-run
channel ch1: finished piece 1 at 27-AUG-09
piece handle=MEDTEST_USERS_20090827 tag=TAG20090827T074351 comment=API Version 2.0,MMS Version 5.0.0.0
channel ch1: backup set complete, elapsed time: 00:00:30
released channel: ch1
released channel: ch2
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch2 channel at 08/27/2009 07:45:00
ORA-19715: invalid format N for generated name
ORA-27302: failure occurred at: slgpn
RMAN-03009: failure of backup command on ch2 channel at 08/27/2009 07:45:01
ORA-19715: invalid format N for generated name
ORA-27302: failure occurred at: slgpn
RMAN>
RMAN> **end-of-file**
RMAN>
Please help.

Answer 1

I removed include current control file, I still get the same error for %N & %f:
backup
incremental level 1
filesperset 1
format '%d_%f_%N_%T_%U'
keep until time "sysdate+1" logs
(database);
RMAN-03009: failure of backup command on ch2 channel at 08/27/2009 09:20:33
ORA-19715: invalid format N for generated name
ORA-27302: failure occurred at: slgpn
continuing other job steps, job failed will not be re-run
channel ch2: starting incremental level 1 datafile backupset
channel ch2: specifying datafile(s) in backupset
channel ch1: finished piece 1 at 27-AUG-09
piece handle=MEDTEST_8_USERS_20090827_3sknnpe8_1_1 tag=TAG20090827T091919 comment=API Version 2.0,MMS Version 5.0.0.
0
channel ch1: backup set complete, elapsed time: 00:00:26
including current SPFILE in backupset
channel ch2: starting piece 1 at 27-AUG-09
released channel: ch1
released channel: ch2
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch2 channel at 08/27/2009 09:20:34
ORA-19715: invalid format f for generated name
ORA-27302: failure occurred at: slgpn
RMAN>
RMAN> **end-of-file**