Microsoft Dynamics Axapta Technical,Functional Coverage

How to show only open order of sales in axapta FormCheckBoxControl checkBoxControl = this.controlCallingMethod(); QueryBuildRange rangeSalesStatus; Boolean ret; ; ret = checkBoxControl.modified(); rangeSalesStatus = SalesTable_ds.query().dataSourceTable(tablenum(SalesTable)).findRange(fieldnum(SalesTable, salesStatus)); if (!rangeSalesStatus) { rangeSalesStatus = SalesTable_ds.query().dataSourceTable(tablenum(SalesTable)).addRange(fieldnum(SalesTable, salesStatus)); } if (checkBoxControl.value() == NoYes::Yes) { rangeSalesStatus.enabled(true); rangeSalesStatus.value(queryValue(SalesStatus::Backorder)); } else { rangeSalesStatus.enabled(false); } SalesTable_ds.executeQuery();