16The Court has consistently held that a national rule must be regarded as a provision on reduction of benefit, within the meaning of Regulation No 1408/71, if the calculation which it requires to be made has the effect of reducing the amount of the pension which the person concerned may claim, because he receives a benefit from another Member State (see, in particular, Case C-442/97 Van Coile [1999] ECR I-8093, paragraph 25, and Case C-161/98 Platbrood [1999] ECR I-8195, paragraph 25).
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