35Furthermore, it is apparent from the Court’s case-law that the principles of equal treatment and non-discrimination and the obligation of transparency preclude any negotiation between the contracting authority and a tenderer during a public procurement procedure, which means that, as a general rule, a tender cannot be amended after it has been submitted, whether at the request of the contracting authority or at the request of the tenderer concerned. It follows that, where the contracting authority regards a tender as imprecise or as failing to meet the technical requirements of the tender specifications, it cannot require the tenderer to provide clarification (judgments of 7 April 2016, Partner Apelski Dariusz, C‑324/14, EU:C:2016:214, paragraph 62 and the case-law cited, and of 4 May 2017, Esaprojekt, C‑387/14, EU:C:2017:338, paragraph 37).
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