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3. If any contracting party has not accepted the Charter when it has entered into force, the contracting parties shall confer to agree whether, and if so in what way, this Agreement, in so far as it affects relations between the contracting party which has not accepted the Charter and other contracting parties, shall be supplemented or amended. 4. During the month of January, 1949, should the Charter not have entered into force, or at such earlier time as may be agreed if it is known that the Charter will not enter into force, or at such later time as may be agreed if the Charter ceases to be in force, the contracting parties shall meet to agree whether this Agreement shall be amended, supplemented or maintained. 5. The signatories of the Final Act which are not at the time contracting parties shall be informed of any objection lodged by a contracting party under the provisions of paragraph 2 of this Article and also of any agreement which may be reached between the contracting parties under paragraphs 2, 3, or 4 of this Article. Article XXX Amendments 1. Except where provision for modification is made elsewhere in this Agreement, amendments to the provisions of Part I of this Agreement or to the provisions of Article XXIX or of this Article shall become effective upon acceptance by all the contracting parties, and other amendments to this Agreement shall become effective, in respect of those contracting parties which accept them, upon acceptance by twothirds of the contracting parties and thereafter for each other contracting party upon acceptance by it. 2. Any contracting party accepting an amendment to this Agreement shall deposit an instrument of acceptance with the Secretary-General of the United Nations within such period as the CONTRACTING PARTIES may specify. The CONTRACTING PARTIES may decide that any amendment made effective under this Article is of such a nature that any contracting party which has not accepted it within a period specified by the CONTRACTING PARTIES shall be free to withdraw from this Agreement, or to remain a contracting party with the consent of the CONTRACTING PARTIES. Article XXXI Withdrawal Without prejudice to the provisions of Article XXIII or of paragraph 2 of Article XXX, any contracting party may, on or after January 1, 1951, withdraw from this Agreement, or may separately withdraw on behalf of any of the separate Customs territories for which it has international responsibility and which at the time possesses full autonomy in the conduct of its external commercial relations and of the other matters provided for in this Agreement. The withdrawal shall take effect on or after January 1, 1951, upon the expiration of six months from the day on which written notice of withdrawal is received by the Secretary-General of the United Nations.