The challenge of an arbitral award for annulment under art. 829 cod. proc. civ. is a form of limited review, being admissible exclusively on the grounds exhaustively listed in the provision, relating to specifically identified errors in procedendo, as well as for non-observance by the arbitrators of the rules of law within the limits set out in art. 829 co. 3 cod. proc. civ.; the same limits govern review by the Supreme Court.