Article 584 of the French Code of civil procedure

In the event of indivisibility with regard to several parties to the contested judgment, the third party opposition is admissible only if all these parties are called to the proceedings.

Original in French 🇫🇷

Article 584

En cas d’indivisibilité à l’égard de plusieurs parties au jugement attaqué, la tierce opposition n’est recevable que si toutes ces parties sont appelées à l’instance.