55It follows that, in so far as, as has been stated in paragraphs 40 and 41 above, the competent national authorities could not, before Regulation No 1360/2013 entered into force, quantify the amount of any reimbursement of levies unduly paid by the economic operators who derive their rights from that regulation, and in so far as those economic operators also could not know that amount, the national rules, interpreted by the referring court as providing that the relevant limitation period would expire before that regulation entered into force, make it practically impossible to exercise the right, conferred on those operators by the EU legal order, to obtain reimbursement of the unduly paid production levies for the marketing years at issue in the main proceedings.
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