56Although national law is applicable to a situation arising from the overpayment of a pension supplement by reason of the authorised maximum income's having been exceeded, it must however be stated that, with regard to a situation concerning a worker who has exercised his right to freedom of movement under the Treaty, it is a requirement of Community law that the detailed procedural rules governing that situation should observe the principles of equivalence and effectiveness (see, to that effect, Case C-261/95 Palmisaiti [1997] ECR I-4025, paragraph 27 and Case C-231/96 Edis [1998] ECR I-4951, paragraph 34).
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