The day the client went broke for a day
Long before Europe switched to the Euro as their currency we had a multitude of currencies and as a consequence even more exchange rates. At that time I worked as a computer programmer, mainly concerned with travel agencies. For one customer we needed to build an interface with their financial system. The travel system we built was used for both booking and keeping (virtual) stock, like pre-ordered hotel rooms and plane seats. Every invoice, either selling or buying needed to be forwarded to the financial system with each detail replicated. ...