Proceedings to set aside an arbitral award on grounds of nullity constitute a limited review, which may be brought only for specified procedural errors and for non-observance of the rules of law within the limits set out in Article 829(3) of the Code of Civil Procedure.
A challenge to the award for violation of the rules of law governing the merits of the dispute is admissible only where expressly provided for by the parties or by statute; in any event a challenge on the ground that the award is contrary to public policy is always admissible.
The sanction of nullity provided for by Article 829(11) of the Code of Civil Procedure in respect of an award containing contradictory provisions must be understood as requiring that the contradiction arise between the different components of the operative part or between the reasoning and the operative part, or amount to a conflict of such gravity as to make it impossible to reconstruct the ratio decidendi.