30Nevertheless, it is clear from the case-law of the Court that, in certain circumstances, several formally distinct services, which could be supplied separately and thus give rise in turn to taxation or exemption, must be considered to be a single transaction when they are not independent (see Case C-425/06 Part Service [2008] ECR I-897, paragraph 51, Case C-276/09 Everything Everywhere [2010] ECR I-12359, paragraph 23). There is a single supply where two or more elements or acts supplied by the taxable person to the customer are so closely linked that they form, objectively, a single, indivisible economic supply, which it would be artificial to split (Case C-41/04 Levob Verzekeringen and OV Bank [2005] ECR I-9433 paragraph 22, and Case C-111/05 Aktiebolaget NN [2007] ECR I-2697, paragraph 23). Such is the case where one or more elements are to be regarded as constituting the principal service, whilst one or more elements are to be regarded, by contrast, as ancillary services which share the tax treatment of the principal service (Case C-349/96 CPP [1999] ECR I-973, paragraph 30, and Part Service, paragraph 52).
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