100. The Tribunal may not decide a matter if the parties have not been heard or summoned.
It is exempted from that requirement in regard to a party to grant an uncontested application. The Tribunal is also exempted therefrom if all of the parties consent to its proceeding on the basis of the record, subject to the power of the Tribunal to summon the parties in order to hear them.
In addition, if a party who has been summoned does not appear at the time fixed for the hearing without having provided a valid excuse for his absence, or appears at the hearing but refuses to be heard, the Tribunal may nonetheless proceed and make a decision.