56It is settled case-law that the general principle which guarantees any litigant the right to plead, in an action brought against a national measure which adversely affects him, that the EU act forming the basis for that measure is invalid does not preclude such a right from being subject to the condition that the person concerned did not have the right to request the EU judicature directly to annul it, under Article 263 TFEU. However, it is only if it can be held that a person would undoubtedly have been entitled to request the annulment of the act in question that he is prevented from pleading its invalidity before the national court having jurisdiction (see, to this effect, judgments in TWD Textilwerke Deggendorf, C‑188/92, EU:C:1994:90, paragraph 23; Valimar, C‑374/12, EU:C:2014:2231, paragraphs 28 and 29; and TMK Europe, C‑143/14, EU:C:2015:236, paragraph 18).
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