81. A lawyer must not act as lawyer for a trustee in bankruptcy or a liquidator in the following cases:(1) he represents the debtor, legal person, partnership or association without legal personality that is under liquidation, a secured creditor or a creditor whose claim is contested; or
(2) he rendered professional services to one of the persons, to the partnership or to the association referred to in subsection 1 in the 2 preceding years, unless he discloses the fact in writing to the creditors or the inspectors.