Article 18 Denunciation 1. After this Convention has been in force for six years, any Member State may denounce it by notifying the depositary of the Convention. The denunciation shall take effect at the end of the financial year following that during which it was notified. 2. After the denunciation has taken effect, the State concerned shall remain bound to honour its share of the payment appropriations corresponding to approved contract authority used both under the budget for the financial year in which the denunciation was notified and under previous budgets. 3. The State concerned shall retain the rights it has acquired up to the date the denunciation takes effect.