Kernrechtsfrage
Whether the pension revision under Art. 17 ATSG was justified by a material change in earning capacity or only by a new assessment of unchanged facts.
Extrahierter Entscheid
There was no material change in health or work capacity; the revocation rested on a different evaluation of the same facts and was unlawful.
Extrahierte Begründung
The 2010 rheumatology opinion relied mainly on changed assessment criteria and not on new or changed medical facts. A mere reappraisal of an essentially unchanged situation cannot support revision.