Treaty establishing a Constitution for Europe - PART III — THE POLICIES AND FUNCTIONING OF THE UNION - TITLE VI — THE FUNCTIONING OF THE UNION - CHAPTER III — ENHANCED COOPERATION - Article III-416
Official Journal 310 , 16/12/2004 P. 0180 - 0180
Article III-416 Any enhanced cooperation shall comply with the Constitution and the law of the Union. Such cooperation shall not undermine the internal market or economic, social and territorial cohesion. It shall not constitute a barrier to or discrimination in trade between Member States, nor shall it distort competition between them. --------------------------------------------------