Upon receipt of an invoice with the display of the KO flag by the participating carrier, the valid carrier immediately knows that no agreement has yet been reached and that a litigation procedure can be initiated immediately. A correspondence can also be initiated directly by the participating carrier when the invoice is established. If the valid carrier finds that the electronic ticket is indeed an interline electronic ticket, the Consolidator VC 11V module requests in real time, thanks to the 7V online link, the VC 6V actions module and sends it the complete e-ticket image to obtain in real time the proportional values of the voucher. At the same time, the Consolidator PC 11P module informs the PC 13P revenue accounting in real time of the e-ticket image and the proportional value of the coupon through the 12P online link.