(135) In order to ensure consistent application of this Regulation across the Union, a consistency mechanism should be established for cooperation between supervisory authorities. This mechanism should apply in particular in cases where a supervisory authority intends to adopt a measure intended to produce legal effects with regard to processing operations that significantly affect a significant number of data subjects in several Member States. It should also apply in cases where the supervisory authority concerned or the Commission requests that the issue be addressed under the consistency mechanism. The mechanism should be without prejudice to measures that the Commission may take in the exercise of its powers under the Treaties.