Principles of International Commercial Contracts, 1994 - UNIDROIT
Chapter 7 - Non-Performance
Section 1 - Non-Performance in General
Article 7.1.2 - Interference by the Other Party
A party may not rely on the non-performance of the other party to the extent that such non-performance was caused by the first party?s act or omission or by another event as to which the first party bears the risk.