Questione giuridica chiave
Whether the cantonal court violated federal law by denying a pension reduction despite the medical evidence
Decisione estratta
The cantonal court could not rely on the existing file alone; the work-capacity assessment was insufficiently substantiated and further medical clarification was required.
Motivazione estratta
The expert opinion did not convincingly explain the alleged 50% capacity or the deviation from earlier assessments. Because significant doubts remained, the investigation principle required further expert evidence.