1.The Agency shall undertake the certification tasks incumbent upon it pursuant to Article 20 as from 28 September 2003. Until that date, Member States shall continue to implement applicable legislation and regulations.
2.During an additional transition period of 42 months from the date referred to in paragraph 1, Member States may continue to issue certificates and approvals by way of derogation from the provisions of Articles 5, 6, 12 and 20 under the conditions specified by the Commission in the measures adopted for their application. When in that context Member States issue certificates on the basis of certificates issued by third countries, the measures adopted by the Commission shall give due consideration to the principles laid down in Article 12(2)(b) and (c).