contain provisions concerning the Member Nations of the Organization, and such non-member States as are members of the United Nations, any of its specialized agencies or the International Atomic Energy Agency, and regional economic integration organizations, including Member Organizations, to which their Member States have transferred competence over matters within the purview of the conventions, agreements, supplementary conventions and agreements, including the power to enter into treaties in respect thereto, which may become parties thereto and the number of acceptances by Member Nations necessary to bring such convention, agreement, supplementary convention or agreement into force, and thus to ensure that it will constitute a real contribution to the achievement of its objectives. In the case of conventions, agreements, supplementary conventions and agreements establishing commissions or committees, participation by non-member States of the Organization that are members of the United Nations, any of its specialized agencies or the International Atomic Energy Agency or by regional economic integration organizations other than Member Organizations, shall in addition be subject to prior approval by at least two-thirds of the membership of such commissions or committees. Where any convention, agreement, supplementary convention or agreement provides that a Member Organization or a regional economic integration organization that is not a Member Organization may become a party thereto, the voting rights to be exercised by such organizations and the other terms of participation shall be defined therein. Any such convention, agreement, supplementary convention or agreement shall, where the Member States of the organization do not participate in that convention, agreement, supplementary convention or agreement, and where other parties exercise one vote only, provide that the organization shall exercise only one vote in any body established by such convention, agreement, supplementary convention or agreement, but shall enjoy equal rights of participation with Member Nations parties to such convention, agreement, supplementary convention or agreement;