56As to the merits, it must be borne in mind that Article 20(4) of Regulation No 1/2003 requires the Commission to state reasons for the decision ordering an investigation by specifying its subject-matter and purpose. As the Court has held, this is a fundamental requirement, designed not merely to show that the proposed entry onto the premises of the undertakings concerned is justified but also to enable those undertakings to assess the scope of their duty to cooperate whilst at the same time safeguarding their rights of defence (judgments in Roquette Frères, C‑94/00, EU:C:2002:603, paragraph 47, and Nexans and Nexans France v Commission, C‑37/13 P, EU:C:2014:2030, paragraph 34).
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