translate English to French: “When it appears from the limited number of the negotiating States and the object and purpose of a treaty that the application of the treaty in its entirety between all the parties is an essential condition of the consent of each one to be bound by the treaty, a reservation requires acceptance by all the parties.”
Sur le caractère supplétif du régime de Vienne, voir notamment: Anthony Aust, Modern Treaty Law and Practice, Cambridge: Cambridge U.P., 2000, p.  124 à 126; John King Gamble, Jr., «Reservations to Multilateral Treaties: A Macroscopic View of State Practice», A.J.I.L.