A famous example often cited by legal scholars, was a case involving the Getty Oil and Pennzoil in very early 1984. The parties had signed a "Memorandum of Agreement" _ viewed by the parties at the time as a Letter of Intent _ for a complex investment and stock transaction, whereby Pennzoil would purchase Getty Oil stock, and set forth general terms of the investment that had been reached in conversations, and also stipulated that the Memorandum was subject to the approval of the Board of Getty Oil. The Board of Getty Oil sooner approved the transaction and both parties announced on January 4, 1984 in a press release, an "agreement in principle" to the terms of the Memorandum. The final agreements for the merging of Texaco and Getty Oil were signed by the parties on January 6 _ 8.
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.