The official business definition of a Purchase Order Numbering System is a system used to assign a unique number to each purchase order. This number is used to track and identify the purchase order and its associated transactions. The system is typically used by companies to keep track of the purchase orders they have issued and received, as well as the associated payments and invoices. The system also helps to ensure that all purchase orders are properly accounted for and that all transactions are tracked accurately. This helps to reduce the risk of fraud and to improve the accuracy of the company’s financial records. The system also helps to ensure that the company is able to easily locate and access the purchase orders they have issued and received.