In the arbitration irrital, expected its nature vault ad integrate one event of will negotiale replacement of the of the parts in conflict, the praise is challengeable only For I Vizi which can vulnerare similar event of will, with consequent exclusion of the appeal per nullity envisaged by art. 828 cod. proc. civ .; therefore, the error de L judgment arbitration, deductible on headquarters challenging, per being relevant, must integrate the extreme of the essentiality and recognizability of which to articles 1429 and 1431 cod. civ., men three not detects the error committed by referees with reference to determination adopted in base to conviction reached after having interpreted and examined the elements acquired.