62Furthermore, as the Court has already held, 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 (judgment in Manova, C-336/12, EU:C:2013:647, paragraph 31 and the case-law cited).
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