Kernrechtsfrage
Whether the onset of incapacity for work had been established too narrowly at 23 April 2004
Extrahierter Entscheid
The existing medical and occupational evidence was insufficient for a final finding; further investigation was required.
Extrahierte Begründung
There were occupational indicators of reduced work capacity before 23 April 2004, but no physician had clearly and conclusively fixed the medically relevant incapacity for that earlier period.