RMAN catalog Downgrade from 11gR1 (11.1.0.6.0) to 10gR2 (10.2.0.4)

I am in the process of downgrading rman catalog from 11gR1 (11.1.0.6.0) to 10gR2 (10.2.0.4). Using expdp/impdp we migrated the rman schema from 11g to 10g. I am able to connect to 10g catalog now. but if i run any command it gives following error.
./rman target sys
Recovery Manager: Release 11.2.0.1.0 - Production on Tue Feb 16 11:21:11 2010
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
target database Password:
connected to target database:
RMAN> connect catalog rman/*******@rman
connected to recovery catalog database
RMAN> show all ;
RMAN configuration parameters for database with db_unique_name NACC are:
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of show command at 02/16/2010 11:21:34
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20299: DBMS_RCVMAN package not compatible with the recovery catalog
RMAN> exit
Have i missed anything which has to be done .
Thanks
Ajeet

Hi Tycho ,
Thanks for your help and suggestions . What i did is i migrated the rman catalog from 11gR1 (11.1.0.6.0) to 10gR2 (10.2.0.4) then connected rman catalog from 11gR2 Client which is the highest version available and then did the following.
RMAN> upgrade catalog;
recovery catalog upgraded to version 11.02.00.01
DBMS_RCVMAN package upgraded to version 11.02.00.01
DBMS_RCVCAT package upgraded to version 11.02.00.01
RMAN>
Now i am able to connect directly and take backup's from 11gR2 , 11gR1 and 10gR2 clients respectively. I also tested the backup's from grid control which are working fine.
Currently my rman catalog database is 10.2.0.4 and my rman catalog schema is 11.02.00.01.
Thanks for everyone's help.
Ajeet
Edited by: user12169940 on Feb 17, 2010 4:02 AM

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<h4>----------------  ----------------  ----------------</h4>
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=======================
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Registering the database
=========================
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Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
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Edited by: vasu77 on Sep 15, 2009 10:01 AM
Edited by: vasu77 on Sep 15, 2009 2:11 PM

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