Article L2113-9 of the French Public procurement code
Where purchasers have joined a common transnational entity, constituted in particular in the form of a European grouping for territorial cooperation, the statutes or a decision of the competent body of this entity shall determine the rules applicable to the contracts of this entity, which shall be:1° Either the law of the State in which its registered office is located;2° Or the law of the State in which it carries…