Article R121-11 of the French Code of civil enforcement procedures
Unless otherwise provided, the application shall be made by summons at the first useful hearing of the enforcement judge. The summons shall contain, on pain of nullity, a reproduction of the provisions of articles R. 121-8 to R. 121-10. It mentions, under the same sanction, the conditions under which the defendant may or must be assisted or represented, as well as, if applicable, the name of the claimant’s representative.