Challenge to the enforcement of an arbitration award based on an allegation of the non-existence of the arbitration clause. Arbitration clause entered into between the grantor Moto Honda da Amazônia Ltda. and the Associação Brasileira de Distribuidores Honda, representing Honda dealerships. Provision for arbitration regarding allegations of breach of the territorial limits of operation of each dealership. "In principle, given that the appellant is a Honda dealership, it is to be presumed that it was a party to the contract, represented by the Associação". Validity of the arbitration award: