28It 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. Such will be the case if the proposed amendments would either extend the scope of the contract considerably to encompass elements not initially covered or to change the economic balance of the contract in favour of the successful tenderer, or if those changes are liable to call into question the award of the contract, in the sense that, had such amendments been incorporated in the documents which had governed the original contract award procedure, either another tender would have been accepted or other tenderers might have been admitted to that procedure (see, to that effect, inter alia, judgment of 19 June 2008, pressetext Nachrichtenagentur, C‑454/06, EU:C:2008:351, paragraphs 34 to 37).
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