[kalex_a]

ds = q.addDataSource(tableNum(PurchTable_request));

        ds3 = ds.addDataSource(tableNum(RcontractTable));
        ds3.addLink(fieldNum(PurchTable_request,  RequestId), fieldNum(RcontractTable, RequestId));
        ds3.joinMode(JoinMode::NoExistsJoin);
        ds3.fetchMode(QueryFetchMode::One2One);

        ds2 = ds.addDataSource(tableNum(PurchTable));
        ds2.addLink(fieldNum(PurchTable_request,  RequestId), fieldNum(PurchTable, RequestId));
        ds2.joinMode(JoinMode::NoExistsJoin);
        ds2.fetchMode(QueryFetchMode::One2One);

        ds4 = ds.addDataSource(tableNum(PurchLine));
        ds4.addLink(fieldNum(PurchTable_request,  RequestId), fieldNum(PurchLine, RequestId));
        ds4.joinMode(JoinMode::NoExistsJoin);
        ds4.fetchMode(QueryFetchMode::One2One);

        ds5 = ds.addDataSource(tableNum(AdvanceHolderTable));
        ds5.addLink(fieldNum(PurchTable_request,  RequestId), fieldNum(AdvanceHolderTable, RequestId));
        ds5.joinMode(JoinMode::NoExistsJoin);
        ds5.fetchMode(QueryFetchMode::One2One);

        PurchTable_request_DS.query(q);
        super();