A direct subcontractor of the holder of the contract who has been accepted and whose terms of payment have been approved by the purchaser shall be paid for the part of the contract for which he is responsible:
1° Under the conditions laid down in this section when the amount of the subcontract is equal to or greater than a threshold set by regulation which may change according to changes in economic circumstances;
2° Under the conditions laid down in Title III of Law No. 75-1334 of 31 December 1975 relating to subcontracting where the amount of the subcontract is less than the threshold set by regulation referred to in 1° of this article.