90They submit, as regards the substance of the claim, that the Commission was at fault in its investigation of the matter, since, first, it did not act with the diligence required by Regulation No 2454/93 and, second, it did not seek additional information as it was required to do (judgment of the Court of Justice in Case C-368/92 Chiffre [1994] ECR I-605, paragraphs 19 and 30).
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