77The position may, however, be different if non-compliance with such formal requirements effectively prevents the production of conclusive evidence that the substantive requirements have been satisfied (judgments of 18 November 2020, Commission v Germany (VAT refund – Invoices), C‑371/19, not published, EU:C:2020:936, paragraph 81 and the case-law cited, and of 17 December 2020, Bundeszentralamt für Steuern, C‑346/19, EU:C:2020:1050, paragraph 48).
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