Moon Invoice helps businesses to create unlimited purchase orders. Here are the different PO fields that need to be filled. 

1. Vendor name (select or add)
2. PO number (automatically added or can create new series)
3. Currency
4. Date 
5. Address
6. Shipping method & cost
7. Item details, including quantity, rate, and discount
8. Description of the product or task
9. Terms and conditions
10. Notes
11. Attachment