180.1. Notwithstanding articles 178 to 180, the recognition and execution of a judgment rendered outside Québec shall be denied where, by reason of the subject matter, the courts of Québec have been vested with exclusive jurisdiction, under Québec law, to hear the demand or action which has given rise to the judgment or where, although the judgment is based upon rules of foreign law, a rule of law is established in Québec the application of which is imperative.