An action for annulment is only available if:
<1° The arbitral tribunal has wrongly declared itself competent or incompetent; or
2° The arbitral tribunal has been improperly constituted; or
3° The arbitral tribunal has ruled without complying with the terms of reference entrusted to it; or
4° The principle of contradiction has not been respected; or
5° The recognition or enforcement of the award is contrary to international public policy.