182 6. Members chosen in accordance with paragraphs 2, 3 and 4 shall fulfil the conditions required by articles 2, 8 and 11 of this Annex. They shall participate in the decision on terms of complete equality with their colleagues. Article 18 Remuneration of members 1. Each elected member of the Tribunal shall receive an annual allowance and, for each day on which he exercises his functions, a special allowance, provided that in any year the total sum payable to any member as special allowance shall not exceed the amount of the annual allowance. 2. The President shall receive a special annual allowance. 3. The Vice-President shall receive a special allowance for each day on which he acts as President. 4. The members chosen under article 17 of this Annex, other than elected members of the Tribunal, shall receive compensation for each day on which they exercise their functions. 5. The salaries, allowances and compensation shall be determined from time to time at meetings of the States Parties, taking into account the workload of the Tribunal. They may not be decreased during the term of office. 6. The salary of the Registrar shall be determined at meetings of the States Parties, on the proposal of the Tribunal. 7. Regulations adopted at meetings of the States Parties shall determine the conditions under which retirement pensions may be given to members of the Tribunal and to the Registrar, and the conditions under which members of the Tribunal and Registrar shall have their travelling expenses refunded. 8. The salaries, allowances, and compensation shall be free of all taxation. Article 19 Expenses of the Tribunal 1. The expenses of the Tribunal shall be borne by the States Parties and by the Authority on such terms and in such a manner as shall be decided at meetings of the States Parties. 2. When an entity other than a State Party or the Authority is a party to a case submitted to it, the Tribunal shall fix the amount which that party is to contribute towards the expenses of the Tribunal. SECTION 2. COMPETENCE Article 20 Access to the Tribunal 1. The Tribunal shall be open to States Parties. 2. The Tribunal shall be open to entities other than States Parties in any case expressly provided for in Part XI or in any case submitted pursuant to any other agreement conferring jurisdiction on the Tribunal which is accepted by all the parties to that case.