login to the database as the schema owner of the catalog and issue this query:
SELECT db_key,db_id FROM db WHERE db_id = 12345639687;
Then execute the following package:
SQL> execute dbms_rcvcat.unregisterdatabase(xxxxxxx, 12345639687);
After that, you can re-register the database.
Did you using RMAN catalog?
If you are used, RMAN catalog before, it means you did created catalog.
Then you must check : which user connecting to catalog with RMAN? Did you connected to catalog database other user?
thanks for greate idea
Message was edited by: TSharma