1. Member States may establish or maintain either official lists of approved contractors, suppliers or service providers or provide for a certification by certification bodies complying with European certification standards within the meaning of Annex VII.

They shall inform the Commission and the other Member States of the address of the certification body or the body responsible for the official lists, to which applications shall be sent.

2. Member States shall adapt the conditions for registration on the official lists referred to in paragraph 1 and for the issue of certificates by certification bodies to the provisions of this subsection.

Member States shall also adapt those conditions to Article 63 as regards applications for registration submitted by economic operators belonging to a group and claiming resources made available to them by the other companies in the group. In such cases, those operators shall prove to the authority establishing the official list that they will have those resources at their disposal throughout the period of validity of the certificate attesting to their registration on the official list and that throughout the same period those companies continue to fulfil the qualitative selection requirements encompassed by the official list or certificate on which operators rely for their registration.

3. Economic operators registered on the official lists or having a certificate may, for each contract, submit to the contracting authority a certificate of registration issued by the competent authority or the certificate issued by the competent certification body.