function TzVATBIL.DETAILGRIDSERCH(DETAILSTATUS : String) : Integer;
begin
    qry_dtl.SQL.Clear;
    if DETAIL_STATUS = 'SAVE' then
       qry_dtl.SQL.Add('select * from edi_vatdtl where doc_no =
                               ' + QuotedStr(inEdit1.Text) +
                               ' order by doc_no asc')
else if DETAIL_STATUS = 'GRID' then
      qry_dtl.SQL.Add('select * from edi_vatdtl where doc_no =
                              ' + QuotedStr(DBGrid1.Fields[0].AsString) +
                              ' order by doc_no asc');
    Result := qry_dtl.RecordCount;
end;

________________에러메세지_______________________________
qry_dtl : Cannot perform this operation on a closed dataset
_______________어떤경유는...______________________________
qry_dtl : Dataset not in edit or insert mode
---------------------------------------------------------
해석만으로는 처리(원인분석)가 힘들더라구여!
지금 상태는 FromCreate시에 OPEN을 했구여! DB는 오라클이구여!
물론 qry_dtl쿼리는 다른부분에서 또 사용하기도 합니다. 사용한다는것은
select를 사용했는거구여!