Case C-247/18: Judgment of the Court (Fourth Chamber) of 26 June 2019 — Italian Republic v European Commission (Appeal — European Social Fund (ESF) — Operational programme for objective No 1 for the Region of Sicily (2000-2006) — Reduction of the financial assistance initially granted — Regulation (EC) No 1260/1999 — Article 39 — Supervisory powers — Necessary verifications — Financial corrections — Calculation — Method by extrapolation)