Asimov Robotics has been having a problem with the application used in its sales division. This application is used to take orders from customers. A number of times, users of the application have been failing to enter shipping addresses, leaving the textbob for this purpose blank. While customers have been charged for their order, the shipping department hasn't been able to send out the order, since they have no way of knowing where it should be shipped. What is required for this application?