Purchase Orders (PO) is how most organisations track and manage orders.
Today they have another purpose as many formal contracts state that they only are valid when a Purchase Order is issued.
The other issue is that they pay based on these Purchase Orders.
Another typical use is when a customer, who has many orders with you, enquires about an order. What the customer always seems to know is their purchase order.
It is easy to add. If they do not have one, I add *Verbal*.
Go here to Detailed Transaction Entry see red arrow.
Here is where you can add their order number.
It is worth it for you to study this screen. Many other details are worth entering. For example, it is often convenient to know who is dealing with this customer.