Kernrechtsfrage
Whether the cantonal court had to order a further medical expert opinion on work capacity.
Extrahierter Entscheid
No further expert opinion was required because the existing expert report had full probative value and no objectively substantiated deterioration was shown.
Extrahierte Begründung
The medical file did not reveal manifestly inaccurate fact-finding. The treating doctor's certificate and later lab results did not provide objective clinical findings contradicting the expert assessment; hepatitis C alone, without symptoms or objective deterioration, did not establish incapacity.