2b. The President of UKE shall communicate to the European Commission and BEREC all adopted final measures referred to in Article 18. 3. The President of UKE while applying the Act, shall take the utmost account of the European Commission Guidelines on market analysis and the assessment of significant market power and the Commission Recommendation according to their current wording, and in the case of departing from their application, shall notify the European Commission and justify his/her position. Article 19a. 1. Where with respect to the measure referred to in Article 18 imposing, amending or withdrawing an obligation imposed on an operator in application of Article 34, Articles 36-40, Article 42, Article 45 or Article 46, the European Commission, within the time limit referred to in Article 19 (1), notifies the President of UKE and BEREC of its reasons for considering that the draft measure would create a barrier to the single market or its serious doubts as to the measure's compatibility with the European Union law, the draft measure in question may not be adopted for a further three months following the receipt of the Commission's notification by the President of UKE. 2. Within the three-month period referred to in paragraph 1, the President of UKE shall cooperate closely with the European Commission and BEREC to identify the most appropriate and effective measure in the light of the objectives laid down in Article 189 (2), whilst taking due account of the views of market participants and the need to ensure the development of consistent regulatory practice. 3. If BEREC shares the position of the European Commission expressed in a notification referred to in paragraph 1, the President of UKE shall cooperate closely with BEREC to identify the most appropriate and effective measure. 4. Before the end of the three-month period referred in paragraph 1, the President of UKE may: 1) amend or withdraw the draft measure taking utmost account of the Commission's notification referred to in paragraph 1 and of BEREC's opinion or 2) maintain the draft measure. 5. Within one month of the Commission issuing the recommendation requiring the national regulatory authority to amend or withdraw the draft measure or lifting the Commission's reservations regarding the draft measure, where BEREC does not share the position of the European Commission, has not issued an opinion or the President of UKE has amended or maintained the draft measure in accordance with paragraph 4, the President of UKE shall communicate to the Commission and BEREC the adopted final measure. The period referred to in the previous sentence may be extended by the President of UKE if it is necessary to conduct consultation proceedings referred to in Article 15. 6. Where the President of UKE decides not to amend or withdraw the draft measure despite a negative position expressed by the European Commission in a Recommendation referred to in paragraph 5, it shall provide a reasoned justification. 7. The President of UKE may withdraw a proposed draft measure at any stage of the procedure. Article 20. 1. The provision of Article 17 shall accordingly apply to cases subject to consolidation proceedings. 2. The President of UKE shall immediately notify the European Commission, BEREC and the regulatory authorities of other Member States with regard to taking the decision referred to in Article 17 (1), providing a reasoned justification.