In theme of arbitration ritual, so that the exception of incompetence of the referees (per non -existence, disability or ineffectiveness of the convention of arbitration) can promptly consider I know llevata in the first defense profit subsequent to the acceptance of the assignment from part of the referees, as requested by art. 817, co. 2, cod. proc. civ., not it is sufficient invoke a chiUU nque reason invalidity of the convention arbitration, ie turning independently from the legal profile in base to which the contestation is formulated, expected that is just the illustraz ion of the reasons post office to foundation of the deduced disability a qualify the question made worth and to distinguish it from others possible that can be not founded or inadmissible.