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.