Article 673 — Institution of Legal Proceedings for Invalidation

1/ The supervisor in reorganization shall institute legal proceedings for invalidation where such proceedings are beneficial to the estate or confer an unjustified preference upon the creditors. 2/ Where the supervisor in reorganization decides not to institute legal proceedings: a) a controller or a creditor, acting ut singuli on behalf of the estate, may institute such proceedings after having summoned the supervisor in reorganization to do so and, where such a summon is duly served, no or a negative response within one month from the receipt; b) where such action is successful, the expenses engaged by the controller or the creditor for purpose of the proceedings shall be borne by the estate.