Article R2393-27 of the French Public procurement code
When the declaration of subcontracting is made after the contract has been notified, the contractor shall submit to the purchaser, against a receipt or by registered letter with acknowledgement of receipt, a special subcontracting deed containing the information mentioned in article R. 2393-25.The holder also proves that no assignment or pledging of receivables resulting from the contract prevents direct payment to the subcontractor, by producing either the single copy or…