32Although the case-law of the Court requires Member States to refrain, during the period prescribed for transposition of a directive, from taking any measures liable seriously to compromise the result prescribed by that directive (see judgment of 18 December 1997 in Inter-Environnement Wallonie, C‑129/96, EU:C:1997:628, paragraph 45), that case-law does not make it possible to impose on a tenderer, before that period has expired, constraints which do not derive from EU law as interpreted by the case-law of the Court.
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