Cause: The caller attempted to alter or drop one of the predefined change

ORA-31504: cannot alter or drop predefined change source

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Answer Posted / guest

Cause: The caller attempted to alter or drop one of the
predefined change sources HOTLOG_SOURCE or SYNC_SOURCE.

Action: Do not attempt to alter or drop a predefined change
source or correct call to supply the name of a user-created
change source.

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