B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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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.
O.C. 129-2015, s. 81.