Against this background, "Macedonian Metro" lodged a complaint with the Commission on 23 January 1997, alleging that the procedure followed by the Greek authorities had infringed the provisions of Directives 93/37 and 89/665, as well as fundamental principles of the EC Treaty such as non-discrimination, transparency and proportionality. ###>Par ailleurs, le plaignant fait observer qu'un motif supplémentaire invoqué par la