Article R611-49 of the French Commercial code
If the mandataire ad hoc, conciliator or expert considers in the course of his mission that the maximum amount of remuneration set by the order appointing him is insufficient, he shall inform the president of the court. The president of the court shall set the new terms of remuneration in agreement with the debtor and after obtaining the opinion of the public prosecutor in the case of recourse to conciliation….