ARTICLE 18 Accession This Pact shall remain open for accession by any State Party to the Protocol on Politics, Defence and Security Cooperation. ARTICLE 19 Amendments 1. Any State Party may propose an amendment to this Pact. 2. Such proposals are to be made to the Chairperson of the Organ who shall duly notify all State Parties of the proposed amendments, at least thirty (30) days in advance, for consideration by those members of the Ministerial Committee who are State Parties to this Pact. 3. An amendment to this Pact shall be adopted by decision of three quarters of all the State Parties. ARTICLE 20 Entry into Force This Pact shall enter into force thirty (30) days after the deposit of the instruments of ratification by two thirds of the Member States. ARTICLE 21 Depositary 1. The original texts of this Pact, and all instruments of ratification and accession, shall be deposited with the Executive Secretary, who shall transmit certified copies to all Member States in English, French and Portuguese. 2. The Executive Secretary of SADC shall register this Pact with the Secretariat of the United Nations and the Commission of the African Union (AU). ARTICLE 22 Breach of the Pact Any State Party may report an alleged breach of this Pact to the Chairperson of the Organ, who shall institute an investigation, compile a report and make recommendations to the Summit. 6