If the holder of the contract who has received the advance payment subcontracts part of the contract during its performance, he shall reimburse the advance payment corresponding to the amount of the subcontracted services and giving rise to direct payment to the purchaser, even if the subcontractor does not wish to benefit from the advance payment.
Repayment by the contractor is deducted from the sums owed to him by the purchaser and begins as from notification of the special act.