The+loyal challenge+per+nullity+has+character+of+appeal+limited+and+not+introduces+a+judgment+appeal+face+per+review+in+merit+of the+ decision+arbitration.+allows+only+the assessment+of the+subsistence+of the+nullity+strictly+listed+in art.+829+of the Italian Civil Code+proc.+civ.,+as+cons Eguanza+by+errors+in+proceeding+o+in+iudicando,+with+the+consequence+that only+only in+hypothesis+of+judgment+termination,+conclusions+with+the assessment+of the+nullity+of the+praise,+it is possible+the+review+of+merit+of the+pronunciation+arbitration+that+form+object+object of the possible.