International trade has been hampered throughout the years by restrictive measures imposed by individual countries for self-protective, trading, political or other reasons. Poor economic conditions in a number of developing and other countries often require special measures to protect an undue outflow of international currency. This results in tightening import restrictions resp. the need for triangular transactions, i.e. payments via third countries within the framework of existing bilateral payment agreements (clearing accounts) et cetera, alternatively barter and/or countertrade operations, all of which present a daily headache for international industry and trade.