Key legal question
Whether the arbitral tribunal lacked jurisdiction because no valid assignment of the receivables and arbitration clause was proven
Extracted holding
The challenge to the tribunal's jurisdiction failed; the court upheld the tribunal's finding that the alleged assignment was not proven.
Extracted reasoning
The appellant did not show any legal error in the tribunal's assessment. Under Swiss law, the assignee bears the burden of proving the assignment and its content when relying on it. The tribunal could examine the alleged assignment prejudicially when ruling on jurisdiction.