Article R2223-55 of the French General Code of Local Authorities
When the holder of a professional training certificate corresponding to one of the functions referred to in articles R. 2223-42 and R. 2223-44 is required to perform another function referred to in this subparagraph, he must acquire, where applicable, the additional professional training corresponding to the new function under the conditions provided for in the articles R. 2223-48 and R. 2223-53.