Key legal question
Whether the alleged new cooperation agreement was proven and could defeat the debt claim under the reliance principle
Extracted holding
The alleged agreement was not proven; the plaintiff's own letter showed he still acknowledged payment of the balance, so no violation of the reliance principle was established.
Extracted reasoning
The contested letter was not sufficient to show a legally binding commitment by the defendant to purchase goods worth CHF 250,000 annually. The plaintiff expressly confirmed that he would repay the remaining balance after deductions and even mentioned possible interest, which contradicted his assertion of an unconditional purchase obligation.