Key legal question
Whether the conditions for procedural revision under Art. 53(1) ATSG were met to revoke the whole invalidity pension retroactively.
Extracted holding
The requirements for procedural revision were not established; the pension could not be revoked on that basis.
Extracted reasoning
The observations and later expert report did not permit a reliable inference that the insured person had already had the same health status and work capacity in 2000. The temporal gap was too large, and the evidence amounted only to an index, not proof of an earlier materially false assessment.