(28)To allow for a proportionate response to instances of incorrect or insufficient application of Union law, a three-step mechanism should apply. First, the Authority should be empowered to investigate alleged incorrect or insufficient application of Union law obligations by national authorities in their supervisory practice, concluded by a recommendation. Second, where the competent national authority does not follow the recommendation, the Commission should be empowered to issue a formal opinion taking into account the Authority’s recommendation, requiring the competent authority to take the actions necessary to ensure compliance with Union law.