Key legal question
Whether the cantonal court violated the insured person's right to be heard by relying on a substitution of reasoning without prior notice.
Extracted holding
Yes. The court had to inform the insured person and allow her to comment before deciding on a new legal basis not raised in the revision proceedings.
Extracted reasoning
The right to be heard under Art. 29(2) Cst. requires prior notification when a judge intends to base the decision on a legal ground neither invoked by the parties nor foreseeable. The omission could not be cured at federal level because of the limited review on appeal.