PICC

PICC  
UNIDROIT Principles of International Commercial Contracts 2016

(1) The notice must specify the obligations to which it relates.
(2) If the notice does not specify the obligation against which set-off is exercised, the other party may, within a reasonable time, declare to the first party the obligation to which set-off relates. If no such declaration is made, the set-off will relate to all the obligations proportionally.
Import: