An LC's independence from the underlying transaction it supports is one of the core tenets that distinguishes this instrument type from other promises. When disputes arise, courts at times have given uneven treatment to independent undertakings with regard to the independence principle.
With regard to how fraud may disturb a bank's obligation to honour under an independent undertaking, courts have used various qualifiers to describe the level necessary. In his expansive article, Dr. Alan Davidson explores the concept of "Letter of Credit Fraud" under law and in the courts.