Traders are better off NOT using documents like LOI, ICPO, FCO, etc. Even if and when they rarely are used in internal trades, on a restricted level within specific industries, they have no legal or customary basis in International Trade whatsoever. In fact the presence of many of these terms are considered to be signs of Advance Fee Fraud, by knowledgeable players and law enforcement.
A fundamental flaw of the LOI, lies in what Vasilios J. Kalogredis, a Wayne, Pennsylvania attorney, calls "the uncertainty and potential risk of any such undertaking." Kalogredisis, a business contract law expert, explains it this way: