Kernrechtsfrage
Whether the defendant had entered into a new contract with the Swiss company instead of the Austrian sole proprietorship.
Extrahierter Entscheid
No proven actual agreement and no interpretive basis under the trust principle showed a change of contractual party.
Extrahierte Begründung
The lower court’s factual findings bound the Federal Supreme Court; the correspondence and surrounding circumstances did not require the defendant to understand the Swiss company as the new contractual partner, especially given the continuity of personnel and business structure.