56Thus, in the event of the annulment of a decision imposing a fine (as in the present case) or of a decision ordering repayment of sums unduly received, case-law has recognised, pursuant to that rule, the applicant’s right to be restored to the situation which it was in before that decision, which involves, inter alia, reimbursement of the principal sum that was unduly paid because of the annulled decision and the payment of default interest (see, to that effect, the IPK judgment, paragraph 29, and the Corus judgment, paragraphs 50, 52 and 53; the Holcim order, paragraphs 30 and 31; and the Opinion of Advocate General Bot in Commission v IPK International, C‑336/13 P, EU:C:2014:2170, points 78 and 79). The Court of Justice has pointed out in this regard that payment of default interest constitutes a measure giving effect to a judgment annulling a measure for the purposes of the first paragraph of Article 266 TFEU in that it is designed to provide compensation at a standard rate for the loss of use of the monies owed and to encourage the debtor to comply with that judgment as soon as possible (IPK judgment, paragraphs 29 and 30).
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