28From the outset, it must be borne in mind that, according to settled case-law, 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 by reason of the fact that he receives a benefit from another Member State (Insalaca, paragraph 16).
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