Hello there, user65842.
The purchase order details cannot be added on the customer invoice directly. You'll need to use a custom field and enter the number as you create the invoice.
Here's how to add a custom field:
- Click the Gear icon in the upper-right corner and select Account and settings.
- Select the Sales tab and go to the Sales form content section.
- Mark the Internal and the Public boxes.
- Name the custom field as PO number.
- Click Save and Done.
When you go back to the invoice, enter the purchase order number manually.
If you're referring to something different, please let us know. We're here to further assist you.
