6-byte utf-8 encoding not supported

Oracle report is going in warning with error "6-byte utf-8 encoding not supported". The reason being the accented characters are not being handled by XML publisher. UTF8 encoding is being used as below but still doesn't work

(select CONVERT((select CONVERT(DESCRIPTION_SAP,

                            'EE8ISO8859P2',

                            'UTF8')

               FROM dual),

             'WE8ISO8859P1',

             'UTF8')