The first distinction is that Order Management deals with items and quantities, whereas Accounts Receivable deals with accounts and amounts. When you create a sales order or invoice with items and quantities, you provide the customer with greater visibility about what they are paying for, generally in the same terms they used when placing the order. Order Entry also provides workflows that allow you to move from a quote to a sales order to a sales invoice. Each transaction has a definition that you use to define the accounting associated with that phase of the order.