Case T-509/21: Judgment of the General Court of 4 September 2024 –IMG v Commission (EU Financial Regulations – Implementation of the EU budget under indirect management by an international organisation – Decision refusing to recognise a legal person as an international organisation – Action for annulment – Lawfulness of the authority to act granted to the applicant’s lawyers – Admissibility – Decision adopted in compliance with a judgment of the Court of Justice – Article 266 TFEU – Res judicata – Principle of good administration – Legal certainty – Regulation (EU, Euratom) No 966/2012 – Article 58 – Delegated Regulation (EU) No 1268/2012 – Article 43 – Regulation (EU, Euratom) 2018/1046 – Article 156 – Concepts of international organisation and international agreement – Errors in law – Manifest error of assessment