[Dimitry]

Проблема анологична, описаной тут
только описаное там же решение не помогает.

Вот код перекрытого мною лукапа:

public void lookup()
{
    Query                   query = new Query();
    QueryBuildDataSource    queryBuildDataSource;
    QueryBuildRange         queryBuildRange;
    SysTableLookup          sysTableLookup;
    ;

    this.text('');

    sysTableLookup = SysTableLookup::newParameters(tableNum(RD_InventType), this);

    sysTableLookup.addLookupField(fieldNum(RD_InventType, InventTypeMK));
    sysTableLookup.addLookupField(fieldNum(RD_InventType, prefix));

    queryBuildDataSource = query.addDataSource(tableNum(RD_InventType));
    queryBuildDataSource.addSortField(fieldNum(RD_InventType, InventTypeMK));
    queryBuildDataSource.addSortField(fieldNum(RD_InventType, prefix));
    queryBuildDataSource.orderMode(orderMode::GroupBy);

    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
//    super();
}