53The answer to the third and fourth questions is that Article 186 of the VAT Directive must be interpreted as meaning that, in cases where the initial deduction of VAT could not be made lawfully, it is for the Member States to determine the date on which the obligation to adjust the undue VAT deduction arises and the time period for which that adjustment must be made, in accordance with the principles of EU law, in particular the principles of legal certainty and legitimate expectations. It is for the national court to determine whether, in cases such as that at issue in the main proceedings, those principles have been respected.
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