A challenge for nullity of an arbitral award is a proceeding of limited review, which may only be brought on specified procedural errors expressly provided for in Article 829 of the Code of Civil Procedure and for breach by the arbitrators of the rules of law within the limits set out in Article 829(3) of the Code of Civil Procedure; the rule requiring specificity in the formulation of grounds applies, and the admissibility of a complaint of nullity for breach of the rules of law in iudicando is confined within the same boundaries as the ground of breach of law available on appeal to the Court of Cassation under Article 360(1)(3) of the Code of Civil Procedure.