When the declaration of subcontracting is made after notification of the contract, the contractor shall submit to the purchaser, against receipt or by registered letter with acknowledgement of receipt, a special subcontracting document containing the information mentioned in article R. 2193-1 .
The holder also proves that no assignment or pledging of receivables resulting from the contract prevents direct payment to the subcontractor, by producing, where the provisions of Chapter I of this Title apply, either the single copy or the certificate of transferability of the contract issued to him, or a certificate or release from the beneficiary of the assignment or pledging of receivables.