[George Nordic]

А зачем там много QueryBuildDataSource?

    Query                   q = new Query();
    QueryBuildDataSource    qbds;
    ;
    qbds = q.addDataSource(tableNum(InventTable));

    qbds = qbds.addDataSource(tableNum(InventTableModule));
    qbds.joinMode(JoinMode::INNERJOIN);
    qbds.relations(true);
    qbds.addRange(fieldnum(InventTableModule, ModuleType)).value(queryValue(ModuleInventPurchSales::Sales));
    qbds.addDataSource(tablenum(BOM));
    qbds.addLink(fieldnum(InventTable, itemId),fieldnum(BomTable, BomId));
    qbds.joinMode(JoinMode::NOEXISTSJOIN);

    info(qbds.toString());