[kashperuk]

Вот пример - прекрасно все работает:

static void OpelItemQueryGroupBy(Args _args)
{
    inventTable     inventTable;
    QueryRun                qr;
    Query                   query;
    QueryBuildDataSource    queryBuildDataSource;
    QueryBuildDataSource    queryBuildDataSourceModule;
    QueryBuildRange         queryBuildRange;
    QueryBuildRange         qbrBlocked;
    ;
    query = new Query();
    queryBuildDataSource = query.addDataSource(tableNum(InventTable));
    queryBuildRange = queryBuildDataSource.addRange(fieldNum(InventTable, ItemId));
    queryBuildRange = queryBuildDataSource.addRange(fieldNum(InventTable, ItemType));
    queryBuildDataSource.orderMode(OrderMode::GroupBy);
    queryBuildDataSource.addSortField(fieldNum(InventTable, ItemGroupId));
    box::info(queryBuildDataSource.toString());
    qr = new QueryRun(query);
    if (qr.prompt())
    {
        while (qr.next())
        {
            inventTable = qr.getNo(1);
            info(strfmt("%1", inventTable.ItemGroupId));
        }
    }
}