In theme of judgment arbitration, the question of the violation of the contradictory must be examined not below the profile formal ma in the area a search vault a the assessment of one actual lesion of the possibility of deduct and contradict, waves if the act has equally reached the purposes of establish a rule re contradictory e if, anyway, non -compliance not has caused prejudice to the part; nor nor does it follow that the nullity of the praise and of the procedure must be declarat e only where in the appeal, to the complaint of the vice suitable a determined them, follow the indication of the specific prejudice that it has it has to the right of defense.