(1) A party may amend his claim or defence in the course of the proceedings if his case, as amended, is still comprised by the arbitration agreement, unless the Arbitral Tribunal considers it inappropriate having regard to the point of time at which the amendments are requested, the prejudice that may be caused to the other party or other circumstances.

(2) The provisions of Article 10 shall not preclude the preceding paragraph from being applied with respect to the right of a party to introduce a counterclaim or a set-off claim.

Article 23 Language

Unless the parties have agreed in the arbitration agreement on the language or languages to be used in the proceedings, the Arbitral Tribunal shall, after consultation with the parties, make such decision.

Article 24 Applicable Law