The objective of the thesis is to examine only one aspect of the legal relationship between an issuer and a beneficiary, i.e., an issuer’s duties regarding notifying a beneficiary of documentary discrepancies in the letter of credit transactions. To lay down a theoretical foundation, the basic principle of the letter of credit law and policy considerations for this legal obligation will be explored in the thesis. In Chapter II, the relevant provisions of the U.C.C and U.C.P. will be examined and compared. Chapter III will focus on how the courts interpret and apply the U.C.C and U.C.P. in the cases regarding an issue’s duties to notify the beneficiary of documentary discrepancies.