Provides art. 817 of the Italian Civil Code civ. Che the part, the which not oversses in the before defense subsequent to acceptance of the referees incompetenz at of these per non -existence, disability or ineffective of the convention of arbitration, not can this reason challenge the praise, Salvo the case of controversy not arbitrators; while art. 829, co. 2, cod. proc. civ. has that the part, the which not has excessive in the first instance d Ifesa subsequent the violation of a rule that discipline the performance of the procedure arbitral, not can this reason challenge the praise.