Kernrechtsfrage
Whether the cantonal court could remand the case to the AI office for a narrow additional medical clarification instead of completing the evidence itself.
Extrahierter Entscheid
The remand to the AI office was excessively disproportionate because a punctual supplementary medical opinion would have sufficed; the cantonal court had to conduct the additional evidence itself.
Extrahierte Begründung
A remand is permissible to establish the facts, but it becomes a denial of justice if the needed clarification is limited and can be obtained through a simple supplementary expert opinion. Here, the existing expert evidence was otherwise sufficient, and only the pre-examination period of work capacity remained unclear.