Questione giuridica chiave
Whether the disability pension could be revised under Art. 17 ATSG due to changed circumstances.
Decisione estratta
No relevant change in earning-related consequences of the unchanged health condition was proven with sufficient probability.
Motivazione estratta
The medical situation remained unchanged; the alleged improvement rested only on comparing an earlier flawed assessment with later earnings. A revision requires a legally relevant change in circumstances, not merely a corrected income comparison.