The tribunals of the Contracting Parties, on being seized of a dispute regarding a contract made between persons to whom Article 1 applies and including an arbitration agreement whether referring to present or future differences which is valid in virtue of the said article and capable of being carried into effect, shall refer the parties on the application of either of them to the decision of the arbitrators.

Such reference shall not prejudice the competence of the judicial tribunals in case the agreement or the arbitration cannot proceed or become inoperative.