Kernrechtsfrage
Whether the social-plan severance clause could be invalidated for fundamental mistake or fraudulent concealment
Extrahierter Entscheid
The employer could not rely on mistake or fraudulent concealment to avoid the normative social-plan provision benefitting the employee.
Extrahierte Begründung
The employer expected individual claims and, in any event, the alleged concealment did not causally determine the conclusion of the social plan; no disclosure duty existed vis-à-vis the employee concerning the pending declaratory action. The employer also failed to show that the disputed condition remained subjectively essential at signing.