How to open database when datafile of nonsystem tablespace is missing?

Hi,
I am runnig 10gR2 on Windows XP SP 2
Here my situation:
My db is running in archive mode. I have taken backup of my tablespace 'ocp' by using RMAN with Database Control.
Now I shutdown the db and removed datafile which belongs to the tablespace.
My problem is now that I am able to start db in mount only.
I can not open it and getting folowing error:
SQL> alter database open;
alter database open
ERROR at line 1:
ORA-01157: cannot identify/lock data file 6 - see DBWR trace file
ORA-01110: data file 6: 'C:\ORACLE\ORADATA\ORCL\OCP.DBF'
My question is:
How to drop the tablespase and run backup?
Thanks

Hi, you must mount the database and put the datafiles in offline mode
ALTER DATABASE DATAFILE '<full_path_file_name>' OFFLINE DROP
After you must open the database.
Luck.
Have a good day.
Regards.

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