The ECB’s ex post reporting requirements are regulated definitively by the EC Treaty (Article 113 (3)): “the ECB shall present to the European Parliament, the Council and the Commission, and also to the European Council, an Annual Report on the activities of the ESCB and on monetary policy in the previous and current year.
The President of the ECB shall submit the Report to the Council and the European Parliament, which may carry out a general review on that basis.