Hi , Dialog forms are extends with Runbase class or Runbasebatch class ,In this class dialog fields are added in dialog method for these dialog fields we can write a lookup method in below manner void Fld9_1_lookup() { Formrun fr = dialog.formRun(); object Control = fr.controlCallingMethod(); SysTableLookup sysTableLookup = SysTableLookup::newParameters(tablenum(EmplTable), dialogEmployee.fieldControl()); Query query = new Query(); QueryBuildDataSource queryBuildDataSource; queryBuildRange maintenancesection; ; sysTableLookup.addLookupfield(fieldnum(EmplTable, EmplId)); SysTableLookup.addLookupMethod(identifierstr(name)); ...