(1) Unless the parties agree otherwise, a party may file an incidental or additional claim or a counterclaim ( "ancillary 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 no later than in the reply, and a counterclaim shall be presented no later than in the counter-memorial, unless the Tribunal decides otherwise.

(3) The Tribunal shall fix time limits for submissions on the ancillary claim.