Contracting entities shall notify to the Commission, if so requested, the following information regarding the application of Article 13(2) and (3) and Article 14:
(a) the names of the undertakings or joint ventures concerned;
(b) the nature and value of the concessions involved;
(c) proof, deemed necessary by the Commission, that the rela tionship between the undertaking or joint venture to which the concessions are awarded and the contracting entity complies with the requirements of Article 13 or Article 14.