Case C-410/04: Judgment of the Court (First Chamber) of 6 April 2006 (reference for a preliminary ruling from the Tribunale Amministrativo Regionale per la Puglia) — Associazione Nazionale Autotrasporto Viaggiatori (ANAV) v Commune di Bari, A.M.T.A.B. Servizio SpA (Freedom to provide services — Local public transport service — Award with no call for tenders — Award by a public authority to an undertaking of which it owns the share capital)