846. The Superior Court may, at the demand of one of the parties, evoke before judgment a case pending before a court subject to its superintending and reforming power, or revise a judgment already rendered by such court, in the following cases:(1) when there is want or excess of jurisdiction;
(2) when the enactment upon which the proceedings have been based or the judgment rendered is null or of no effect;
(3) when the proceedings are affected by some gross irregularity, and there is reason to believe that justice has not been, or will not be done;
(4) when there has been a violation of the law or an abuse of authority amounting to fraud and of such a nature as to cause a flagrant injustice.However, in the cases provided in paragraphs 2, 3 and 4 above, the remedy lies only if, in the particular case, the judgments of the court seized with the proceeding are not susceptible of appeal.