90It follows from the foregoing that the Commission, in failing to investigate the relations between Mr A and the GFA consortium, made a manifest error of assessment. In infringing the principle of sound administration in that way, the Commission also violated the principle of equal treatment as between tenderers, which requires it to examine each tender impartially and objectively in the light of the requirements and general principles governing the tendering procedure, in order to ensure that all the tenderers are afforded the same opportunities.
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