Art.+817+of the Italian Civil Code+civ.+Attributes+to+referees+the+power+of+decide+in+order+to+own+competence,+where the+validity,+the+content+or+the width+of the+convention+of+arbitration+or+the+regular+constitution ne of the body+referee+are+contested+in the+course+of the+procedure,+specifying,+per+second+paragraph,+that+such+principle+is+applicable+even in the+case+in++i+powers+of the+referees+are+contested+in+any one +seat+per+any+reason+surviving+in the+course+of the+procedure.+the+character+exclusive+of the+power+recognized+to+referees+from the+aforementioned+provision+found+then+confirmation+in+dictation+of art.+819-ter,+ co.+3,+cod.+proc.+civ.,+to+senses+of+which+the+slope+of the+procedure+arbitration+precludes+the+proposition+of+questions+judicial+with+ad+object+the invalidity+or+ineffectiveness+of the+convention+of+arbitration.