[Sada]

qbs = query.addDataSource( tableNum(ProdTable) );

        qbs = qbs.AddDataSource( tableNum(SalesTable) );
        if( SalesEditFilter.valueStr() )
        {
            qbs.addRange( fieldNum( SalesTable, SalesId )).value(SalesEditFilter.valueStr());
        }

        qbs.addLink(fieldNum( SalesTable, SalesId ), fieldNum( ProdTable, InventRefId ));

a так?