Create Lookup method with sorting & range on items for same Sales order items

\Forms\SalesTable\Data Sources\SalesLine\Fields\MTI_RollTo\Methods\lookup

// for creating dropdown list (lookup) of items for same SalesId in SalesLine

public void lookup(FormControl _formControl, str _filterStr)

{

    Query                   query;

    QueryBuildDataSource    queryBuildDataSource;

    Args                    args = new Args();

    SysTableLookup sysTableLookup = SysTableLookup::newParameters(tablenum(SalesLine),_formControl);

    ;

    if (args && args.dataset())

    {

        switch(args.dataset())

        {

            case tableNum(SalesLine) :

            SalesLine = args.record();

            break;

        }

    }

    query = new Query();

    queryBuildDataSource = query.addDataSource(tablenum(SalesLine));

    sysTableLookup.addLookupfield(fieldnum(SalesLine, ItemId),true);

    sysTableLookup.addLookupMethod("itemname");

    sysTableLookup.addLookupfield(fieldnum(SalesLine, hrtManufacturerPartNo));

    queryBuildDataSource.addSortField(fieldnum(SalesLine, ItemId));

    queryBuildDataSource.addRange(fieldnum(SalesLine, SalesId)).value(SalesLine.SalesId);

    sysTableLookup.parmQuery(query);

    sysTableLookup.parmUseLookupValue(true);

    sysTableLookup.performFormLookup();

}