The only successful instance of such an arrangement is the Bretton Woods conference in 1944, but even then the exchange rates that were fixed there proved unrealistic, and a major wave of parity alterations was soon needed (as well as the maintenance of exchange controls).
Or, même à l’époque, les taux de changes fixés à la conférence se sont avérés irréalistes. Il a ensuite fallu céder à une grande vague de changements de parité (et de maintenance des contrôles du change).