Judgment of the Court of First Instance of 6 March 2003 in Cases T-228/99 and T-233/99: Westdeutsche Landesbank Girozentrale and Land Nordrhein-Westfalen v Commission of the European Communities (State aid — Commission's lack of competence — Infringement of the rights of the defence — Infringement of essential procedural requirements — Concept of aid — Infringement of Articles 87 EC and 295 EC — Market economy investor — Appropriate rate of remuneration — Infringement of the obligation to state reasons)