The starting point for any sales order processing establishment and registration of the order's basic information such as customer, items and amounts. All other information can in principle be obtained or produced from these elements basic data and parameters. Depending on the order to proceed and the desired effect can change or enter additional information.
An order can be created either from a customer / contact or by calling a form for a desired course. I.e. depending on the type of transaction you wish to conduct, for example. sale, delivery or billing, start order registration in a corresponding form. Once the order is created it will be assigned a number based on the order number series (003). Have you once registered an order, process change by calling the order is on a different form. Thus, there is no system specific scenario - the user can jump between the forms that are defined for their user group.