MPEP App. T, Rule 88
Amendment of the following provisions of these Regulations shall require that no State having the right to vote in the Assembly vote against the proposed amendment:
Amendment of the following provisions of these Regulations shall require that no State referred to in Article 58(3)(a)(ii) and having the right to vote in the Assembly vote against the proposed amendment:
Any proposal for amending a provision referred to in Rules 88.1 or 88.3 shall, if the proposal is to be decided upon in the Assembly, be communicated to all Contracting States at least two months prior to the opening of that session of the Assembly which is called upon to make a decision on the proposal.