26It must first be borne in mind that EC Treaty provisions relating to charges having equivalent effect and those relating to discriminatory internal taxation cannot be applied together, so that under the system of the Treaty the same measure cannot belong to both categories at the same time (see, in particular, Case C-90/94 Haahr Petroleum [1997] ECR I-4085, paragraph 19; Case C-387/01 Weigel [2004] ECR I-4981, paragraph 63, and Joined Cases C-393/04 and C-41/05 Air Liquide Industries Belgium [2006] ECR I-5293, paragraph 50).
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