HERE IS THE CODE WRITTEN ON FORM METHOD INIT
[Form]
public class Tri_TruckTripHistory extends FormRun
{
public void init()
{
Tri_SchdulingTbl schedulingTable;
super();
if(element.args() && element.args().menuItemName() == menuItemDisplayStr(Tri_TruckAssignment_TripHistory))
{
schedulingTable = element.args().record();
Tri_TransportRouteLine_ds.queryBuildDataSource().clearRanges();
Tri_TransportRouteLine_ds.queryBuildDataSource().addOrderByField(fieldNum(Tri_TransportRouteLine, RecId), SortOrder::Descending);
Tri_TransportRouteLine_ds.queryBuildDataSource().orderMode(OrderMode::OrderBy);
Tri_TransportRouteLine_ds.queryBuildDataSource().addRange(fieldNum(Tri_TransportRouteLine, TrailerPlateNum)).value(schedulingTable.TrailerPlateNum);
}
}
}