On the customer, open their invoice settings:
In those invoice settings, add the purchase order number(1) then click Save (2):
All their invoices will have this value as their default purchase order.
How do I set a purchase order on a customer?
On the customer, open their invoice settings:
In those invoice settings, add the purchase order number(1) then click Save (2):
All their invoices will have this value as their default purchase order.