111In those circumstances, according to Alpharma, the contested regulation must be annulled in so far as the Council failed to meet its obligation to state clearly the legal basis of the contested regulation (Case C-325/91France v Commission [1993] ECR I-3283, paragraph 26). In the absence of such a clear indication of the legal basis for withdrawing the authorisation of bacitracin zinc, Alpharma maintains that it is left uncertain as to the legal basis of the regulation (Case 45/86Commission v Council [1987] ECR 1493, paragraph 9). In particular, it submits, with reference to Case C-143/93Van Es Donane Agenten [1996] ECR I-431, paragraphs 27 to 32, that, in essence, in a situation such as this, where certain provisions of a measure to which reference is made in other measures are amended, the Community institutions are required at the same time to make all the necessary consequential amendments to those other measures, in order to ensure a sufficient degree of legal certainty as to the applicable conditions for the parties concerned.