Case C-52/14: Judgment of the Court (Fourth Chamber) of 11 June 2015 (request for a preliminary ruling from the Oberverwaltungsgericht für das Land Nordrhein-Westfalen — Germany) — Pfeifer & Langen GmbH & Co. KG v Bundesanstalt für Landwirtschaft und Ernährung (Reference for a preliminary ruling — Protection of the financial interests of the European Union — Regulation (EC, Euratom) No 2988/95 — Article 3(1) — Limitation period — Dies a quo — Repeated irregularities — Interruption of the limitation period — Conditions — Competent authority — Person in question — Act relating to investigation or legal proceedings concerning the irregularity — Time-limit equal to twice the limitation period)