Judgment_paragraph 61 · Gräfendorfer Geflügel- und Tiefkühlfeinkost Produktions GmbH and Others v Hauptzollamt Hamburg and Hauptzollamt Kiel (C-415/20)

61In that regard, it must be observed, first of all, that such a breach may concern any rule of EU law, whether it be a provision of primary or secondary law (see judgments of 9 November 1983, San Giorgio, 199/82, EU:C:1983:318, paragraph 12, and of 9 September 2021, Hauptzollamt B (Optional tax reduction), C‑100/20, EU:C:2021:716, paragraph 26), or a general principle of EU law (see judgment of 9 September 2021, Hauptzollamt B (Optional tax reduction), C‑100/20, EU:C:2021:716, paragraph 28).