39In that regard, it must be held that the decision authorising the change in composition of the consortium to which the contract had been awarded necessitates an amendment of the award decision which may be regarded as substantial if, in the light of the particular features of the tender award procedure in question, it alters one of the essential elements that were decisive in the adoption of the award decision. In that situation, all relevant measures provided for by national law would have to be taken to remedy that irregularity, which might extend to a new award procedure (see, by analogy, Case C‑91/08 Wall EU:C:2010:182, paragraphs 38, 39, 42 and 43).
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