The members of the Committee and of the ad hoc conciliation commissions which may be appointed under article 21, paragraph I (e), shall be entitled to the facilities, privileges and immunities of experts on mission for the United Nations as laid down in the relevant sections of the Convention on the Privileges and Immunities of the United Nations. Article 24 The Committee shall submit an annual report on its activities under this Convention to the States Parties and to the General Assembly of the United Nations. PART III Article 25 1. This Convention is open for signature by all States. 2. This Convention is subject to ratification. Instruments of ratification shall be deposited with the Secretary-General of the United Nations. Article 26 This Convention is open to accession by all States. Accession shall be effected by the deposit of an instrument of accession with the SecretaryGeneral of the United Nations. Article 27 1. This Convention shall enter into force on the thirtieth day after the date of the deposit with the Secretary-General of the United Nations of the twentieth instrument of ratification or accession. 2. For each State ratifying this Convention or acceding to it after the deposit of the twentieth instrument of ratification or accession, the Convention shall enter into force onthe thirtieth day after the date of the deposit of its own instrument of ratification or accession. Article 28 1. Each State may, at the time of signature or ratification of this Convention or accession thereto, declare that it does not recognize the competence of the Committee provided for in article 20. 2. Any State Party having made a reservation in accordance with paragraph I of this article may, at any time, withdraw this reservation by notification to the Secretary-General of the United Nations. Article 29 1 . Any State Party to this Convention may propose an amendment and file it with the SecretaryGeneral of the United Nations. The SecretaryGeneral shall thereupon communicate the proposed amendment to the States Parties with a request that they notify him whether they favour a