50In any event, as the Advocate General also observed in point 88 of his Opinion, neither the principle of legal certainty nor the principle of the protection of legitimate expectations, invoked by the referring court, entails an obligation to maintain the legal order unchanged over time. Economic operators are not justified in having a legitimate expectation that an existing situation which is capable of being altered by the EU institutions in the exercise of their discretionary power will be maintained (judgment of 26 June 2012, Poland v Commission, C‑335/09 P, EU:C:2012:385, paragraph 180 and the case-law cited).
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