Oracle Forms

hi,

i have a mater detail form. form is displaying current day values as default.
i put a calendar to form for users can be select date.

now,
i want to excute_query when new date selected from calender.
i writed below code to text_item(calendar) when_validate_item trigger but it nor woring
.giving frm-40137 error.

code is;
:parameter.GUNLUK_TARIH := Name_In('PARAMATRELER.TARIH_SON');
SET_RECORD_PROPERTY(1,'XXMOB_YAPBOZ_TAHTASI_GV',STATUS,QUERY_STATUS);
go_block('XXMOB_YAPBOZ_TAHTASI_GV');
DO_KEY('Execute_query');

any help please
best regards
aykut