29In particular, it would be unacceptable, according to the Commission, for reasons of transparency, consistency and equality, for individual tenderers to be able to enter into a dialogue with the contracting authority in order to have it reconsider, on a bilateral basis, their individual offers. In particular, it is therefore improper for the Commission, as contracting authority, to contact a particular tenderer so that the latter could set its tender in order, except in respect of certain specific issues where this is expressly permitted. Indeed, such an approach would fly in the face of a system which is based on the fundamental principle of equality of treatment between all tenderers (Case C-243/89 Commission v Denmark [1993] ECR I-3353, paragraph 37, and Case C-87/94 Commission v Belgium [1996] ECR I-2043, paragraph 70; also Opinion of Advocate General Stix-Hackl in Case C-57/01 Makedoniko Metro and Michaniki v Dimossio [2003] ECR I-1091, paragraph 66). The Commission also points out, in this regard, that such contacts would impose on it a heavy workload, since in 2001, for the TACIS Regulation alone, Directorate A of Commission DG EuropeAid Cooperation Office, dealt with some 240 contracts.
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