Canon 1183

If the injustice of the arbitration sentence is evident, the

judge who issued the decree of confirmation shall hear a complaint of nullity against the sentence which has become an adjudged matter (res iudicata), the opposition of a third party

against the sentence, or a request for a total reinstatement

(restitutio in integrum); he shall also provide for the correction of any material error, according to the ordinary norm of

law.