Message Oracle ORA-41684 - invalid value for the RLM$ENABLED column

ERRORinvalid value for the RLM$ENABLED column
CAUSEAn attempt was made to insert or update a value other than Y or N into the RLM$ENABLED column of a rule class table.
ACTIONRetry the DML statement with a value of Y or N for the RLM$ENABLED column.