RMAN-20512: source database already registered in recovery catalog

Cause: Source database was already registered in the recovery catalog.

Action: If the source database is really registered, there is no need to register it again. Note that the recovery catalog enforces that all databases have a unique DBID. If the new database was created by copying files from an existing database, it will have the same DBID as the original database and cannot be registered in the same recovery catalog.

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