1. Member States shall take the necessary steps to ensure that there are no legal impediments preventing the exchange, as between undertakings included within the scope of supervision on a consolidated basis, mixed-activity holding companies and their subsidiaries, or subsidiaries of the kind covered in Article 127(3), of any information which would be relevant for the purposes of supervision in accordance with Articles 124 to 138 and this Article.
2. Where a parent undertaking and any of its subsidiaries that are credit institutions are situated in different Member States, the competent authorities of each Member State shall communicate to each other all relevant information which may allow or aid the exercise of supervision on a consolidated basis.
Where the competent authorities of the Member State in which a parent undertaking is situated do not themselves exercise supervision on a consolidated basis pursuant to Articles 125 and 126, they may be invited by the competent author