This sub-section does not apply to invoices issued in performance of contracts awarded by:
1° The State and its public establishments in the event of national defence or security imperatives;
2° The Caisse des dépôts et consignations;
3° The public establishment mentioned inArticle L. 2142-1 of the Transport Code;
4° SNCF, SNCF Réseau and SNCF Voyageurs.