This error is added for unknown date formats that may have unexpected behavior.
SELECT TO_CHAR(DATE '1998-12-25','iw-iyyy') FROM DUAL;
SELECT
!!!RESOLVE EWI!!! /*** SSC-EWI-OR0008 - UNKNOWN FORMAT, MAY HAVE UNEXPECTED BEHAVIOR ***/!!!
TO_CHAR(DATE '1998-12-25','iw-iyyy'') FROM DUAL;