[rkorchagin]

Ну в общем имел в виду

    while select VendInvoiceJour join vendTrans join  vendInvoiceTrans where
         VendInvoiceJour.PurchId == vendInvoiceTrans.PurchID &&
         VendInvoiceJour.InvoiceId == vendInvoiceTrans.InvoiceId &&
         VendInvoiceJour.InvoiceDate == vendInvoiceTrans.InvoiceDate &&
         VendInvoiceJour.numberSequenceGroup == vendInvoiceTrans.numberSequenceGroup
                                     &&
         vendInvoiceJour.LedgerVoucher == vendTrans.Voucher &&
         vendInvoiceJour.InvoiceAccount == vendTrans.AccountNum &&
         vendInvoiceJour.InvoiceDate == vendTrans.TransDate
                                &&
            vendInvoiceTrans.InvoiceId == "RV300654228" //&&
//            vendTrans. //range on vendTrans

    
    {
        info(VendInvoiceJour.InvoiceId);
    }

То есть AND между результатами выборки из VendinvoiceTrans и vendTrans.