[DreamCreator]

Вот костяк, который работает:

public void lookup(FormControl _formControl, str _filterStr)
{
    FormStringControl       formControl     ;
    QueryBuildDataSource    qbdsVendInvoice ;
    QueryBuildDataSource    qbdsSalesTable  ;
    QueryBuildRange         qbRange         ;
    Query                   query = new Query() ;
    SysTableLookup          sysTableLookup = SysTableLookup::newParameters( tableNum( CustInvoice4PaymJour_RU ), _formControl ) ;
    ;

    //  добавление полей в форму выпадающего списка
    sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, SalesId ) ) ;
    sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, InvoiceAccount ) ) ;
    sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, Invoice4PaymId ) ) ;
    sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, Invoice4PaymDate ) ) ;
    sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, Invoice4PaymAmount ) ) ;
    sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, CurrencyCode ) ) ;
    // TODO sysTableLookup.addLookupfield( fieldNum( CustInvoice4PaymJour_RU, Note_RU ) ) ;

    qbdsVendInvoice = query.addDataSource( tableNum( CustInvoice4PaymJour_RU ) ) ;

    /*
    if( ledgerJournalTrans.AccountType == LedgerJournalACType::Cust && ledgerJournalTrans.AccountNum )
    {
        qbRange = qbdsVendInvoice.addRange( fieldnum( CustInvoice4PaymJour_RU, InvoiceAccount ) ) ;
        qbRange.value( ledgerJournalTrans.AccountNum ) ;
    }

    // TODO qbRange = qbdsVendInvoice.addRange( fieldnum( CustInvoice4PaymJour_RU, isPaid ) ) ;
    qbRange.value( SysQuery::value( NoYes::No ) ) ;

    qbdsSalesTable = qbdsVendInvoice.addDataSource( tableNum( SalesTable ) ) ;
    qbdsSalesTable.joinMode( JoinMode::InnerJoin ) ;
    qbdsSalesTable.addLink( fieldNum( CustInvoice4PaymJour_RU, SalesId ), fieldNum( SalesTable, SalesId ) ) ;
    qbRange = qbdsSalesTable.addRange( fieldNum( SalesTable, SalesStatus ) ) ;
    qbRange.value( SysQuery::range( SalesStatus::None, SalesStatus::Delivered ) ) ;
    */

    sysTableLookup.parmQuery( query ) ;
    //formRunlookup = sysTableLookup.formRun();

    //formControl = _formControl ;

    sysTableLookup.performFormLookup();
    //_formControl.performFormLookup( formRunLookup ) ;
}

+ путаница была CustInvoice4PaymJour_RU и VendInvoice4PaymJour_RU
(upd: второй пункт убрал)