Kernrechtsfrage
Whether the cantonal court violated the right to be heard by relying on substitution of grounds without prior notice.
Extrahierter Entscheid
No violation occurred because reconsideration had already been raised by the AI office and the insured had an opportunity to respond but waived it.
Extrahierte Begründung
A court may uphold a revision decision on reconsideration grounds, but must let the insured comment if that ground was not otherwise in the proceedings. Here the possibility was expressly mentioned in the authority's submissions, so the appellant could not be surprised.