19It follows from the Court’s case-law that the principle of equal treatment and the obligation of transparency resulting therefrom preclude, following the award of a public contract, the contracting authority and the successful tenderer from amending the provisions of that contract in such a way that those provisions differ materially in character from those of the original contract (see, to that effect, judgment of 7 September 2016, Finn Frogne, C‑549/14, EU:C:2016:634, paragraph 28).
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