Article 47
Ancillary Claims
(1) Except as the parties otherwise agree, a party may present an incidental or additional claim or counter-claim, provided that such ancillary claim is within the scope of the arbitration agreement of the parties.
(2) An incidental or additional claim shall be presented not later than in the reply and a counter-claim no later than in the counter-memorial, unless the Tribunal, upon justification by the party presenting the ancillary claim and upon considering any objection of the other party, authorizes the presentation of the claim at a later stage in the proceeding.