Backup & Recovery :: Restore And Recover Database Excluding Tablespace

I am doing some test, seeking your expert opinion.I have a database and have the following backup strategy.

1) Database running in archive log mode.
2) First I backup all the table space excluding one tablespace 'DP_TS_LOB'.

RMAN> CONFIGURE EXCLUDE FOR TABLESPACE 'DP_TS_LOBS';
RMAN> BACKUP DATABASE;

3) I take a separate Backup of DP_TS_LOB tablespace.

RMAN> BACKUP TABLESPACE DP_TS_LOB;

4) I backup all the archived redo logs.

RMAN> SQL 'ALTER SYSTEM ARCHIVE LOG CURRENT';
RMAN> backup archivelog all delete input;

Now I wanted to restore the database from the backup excluding the DP_TS_LOB and bring it up and running. DP_TS_LOB is huge and used only on certain work flows. I don't want the database to be down until we restore DP_TS_LOB. I wanted to restore all the other tablespace and bring the database up operational and restore and recover the DP_TS_LOB tablespace datafile's in background taking the datafiles of DP_TS_LOB tablespace offline.I tried the following but unsuccessful.

RMAN> restore controlfile to 'g:ctl_bckctl_01' from autobackup;
RMAN> restore spfile to 'g:ctl_bckspfile' from autobackup;
RMAN> sql "create PFILE = ''G:ctl_bckPFILE'' from SPFILE = ''G:ctl_bckSPFILE''";

Update the new parameter with new control file name. Copied the control file and parameter file to corresponding location.

RMAN> startup nomount pfile=D:appdivaproduct11.1.0db_1databasepfile;
RMAN> restore database skip tablespace 'dp_ts_lob';
RMAN> alter database mount;
RMAN> sql 'alter database datafile 8 offline'; ==> datafile of DP_TS_LOB tablespace.

First I assumed "Recover Database" will only recover online database files. But got the following error.

RMAN> recover database;

Starting recover at 27-JUL-11
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 07/27/2011 18:23:03
RMAN-06094: datafile 8 must be restored

Then I tried recovering data file separately, but same error.

RMAN> recover datafile 1;

Starting recover at 27-JUL-11
using channel ORA_DISK_1

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 07/27/2011 18:24:30
RMAN-06067: RECOVER DATABASE required with a backup or created control file