2023.03.14(Predata가 null으로 보낼때)

//검사결과참고치            
            PreData searchParam = null;
            AmcData amcDataParam = new AmcData
            {
                header = new HeaderData { debug = 0 },
                preDatas = new PreDatas
                        {
                            { "IPD", searchParam },
                        }
            };

            var responseData = await CommService.CallServiceAsync("SHMGZ7110R", amcDataParam, this, LoadingType.BlockSearch);
            DataTable dtExRefVal = responseData.recordSets["ORS"].ToDataTable(false);
            dtExRefVal.AcceptChanges(); // 조회후 데이터 상태 초기화