The buyer defines what is being ordered
A purchase order identifies the buyer, supplier, requested items, quantities and delivery details. The buyer’s internal approval process happens outside this generator. A PDF alone does not prove the supplier accepted the request.
The seller identifies what is being billed
An invoice lists the charges now payable, its own number and payment terms. Include the customer’s purchase-order reference if their accounts team requires it. Use actual billable quantities rather than copying an order blindly.
Match three records
Compare the order, delivery record and invoice. For an order of twelve units with only eight delivered, check the agreement before accepting a bill for all twelve. A packing slip can show the delivered quantity without exposing prices.
Keep numbers distinct
PO-014 and INV-062 can describe the same transaction without sharing the same number. Put the PO in the invoice reference field and retain both records.