[Eldar9x]

В смысле если так:

qbds = query.addDataSource(tableNum(Jls_ShaftCriterionTable));
...
qbds1 = qbds.addDataSource(tableNum(InventTable), "InventTable_ds");
        qbds1.joinMode(JoinMode::InnerJoin);
        qbds1.relations(false);
        qbds1.addLink(fieldnum(Jls_ShaftCriterionTable, ItemId), fieldNum(InventTable, ItemId));

        sysTableLookup.addLookupField(fieldNum(Jls_ShaftCriterionTable, ItemId));
        sysTableLookup.addLookupfield(fieldNum(InventTable, ItemName));

то нет, не работает