Case T-604/15: Judgment of the General Court of 22 May 2019 — Ertico — ITS Europe v Commission (Seventh Framework Programme for research, technological development and demonstration activities — Recommendation 2003/361/EC — Decision of the Commission’s Validation Panel on qualification as a micro, small and medium-sized business — Request for review under sections 1.2.6 and 1.2.7 of the Annex to Decision 2012/838/EU, Euratom — No administrative appeal within the meaning of Article 22 of Regulation (EC) No 58/2003 — Rights of the defence — Principle of sound administration — Legal certainty — Legitimate expectations — Res judicata — Criteria for the definition of micro, small and medium-sized businesses in EU policies — Concept of an ‘enterprise’ — Concept of an ‘economic activity’ — Criterion of independence — Obligation to state reasons)