319Accordingly, since the determination of the question whether the aid was limited to the minimum is of essential importance in the general scheme of the contested decision (Westdeutsche Landesbank Girozentrale v Commission, cited in paragraph 62 above, paragraph 420) and since it is not for the Court to substitute its own assessment for that of the Commission in proceedings for annulment (SNCF and British Railways v Commission, cited in paragraph 309 above, paragraph 64), that decision must be annulled and there is no need to consider the merits of the objections put forward by the applicant regarding the conditions imposed by the contested decision.