1. Observance of the obligations referred to in Article 30(3) by subcontractors shall be ensured through appropriate action by the competent national authorities acting within the scope of their responsibility and remit.

2. In the concession documents, the contracting authority or the contracting entity may ask or may be required by a Member State to ask the tenderer or the applicant to indicate in its tender any share of the concession it may intend to subcontract to third parties and any proposed subcontractors. This paragraph shall be without prejudice to the question of the main concessionaire's liability.

3. In the case of works concessions and in respect of services to be provided at the facility under the oversight of the contracting authority or the contracting entity, after the award of the concession and at the latest when the performance of the concession commences, the contracting authority or the contracting entity shall require the concessionaire to indicate to the contracting authority or the contracting entity the name, contact details and legal representatives of its subcontractors, involved in such works or services, insofar as known at that point in time. The contracting authority or the contracting entity shall require the concessionaire to notify it of any changes to that information during the course of the concession as well as of the required information for any new subcontractors which it subsequently involves in such works or services.