Web Service Logic Faults

While everyone is bitching about lack of security as well as revenue in web services, there is a problem most people are overlooking: logic faults.  What are logic faults?  A logic fault is what should happen when an order for 5 million pounds of Ben & Jerry arrives from Siberia.  A logic fault is what should happen when someone's daily trade volume grows ten fold overnight.  A logic fault is what should happen if someone named Saddam Hussein orders one of those George Bush dolls.