In the matter of the challenge of the arbitral award for nullity, the Court of Appeal which declares the nullity of the arbitral award on the ground of a deficiency or illogicality of reasoning does not carry out an impermissible re-examination of the merits of the dispute, but rather reviews the lawfulness of the arbitral decision with respect to the correct application of rules of law, where it ascertains that the arbitrators failed fully to assess the elements of the factual basis of the invalidity declared and, in so doing, arrived at a ruling unsupported by an adequate chain of reasoning.