Key legal question
Whether the previous whole disability pension could be revised or reopened after the insured stopped self-employment.
Extracted holding
The business closure and resulting change from a special assessment to the ordinary income-comparison method constituted a revision-relevant change in circumstances.
Extracted reasoning
A materially relevant change may also be economic, even if the health condition stays the same. The court left open whether reopening was justified because a revision ground under Art. 17 ATSG existed in any event.