Article L1262-4-1 of the French Labour Code
I.-A client or project owner who enters into a contract with a service provider who posts employees, under the conditions mentioned in articles L. 1262-1 and L. 1262-2, shall check with the latter, before the posting begins, that it has fulfilled the obligations mentioned in I and II of article L. 1262-2-1. If his co-contractor has not provided him with a copy of the declaration referred to in I of…