46In accordance with settled case-law, in the absence of harmonised rules governing the reimbursement of charges imposed in breach of EU law, the Member States retain the right to apply procedural rules provided for under their national legal system, in particular concerning limitation periods or time-bars, subject to observance of the principles of equivalence and effectiveness (see, to that effect, judgments of 8 September 2011, Q-Beef and Bosschaert, C‑89/10 and C‑96/10, EU:C:2011:555, paragraph 34, and of 20 December 2017, Caterpillar Financial Services, C‑500/16, EU:C:2017:996, paragraph 37).
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