Purchase Order vs Sales Order in Export/Import: What Each One Does
How a purchase order and a sales order relate to each other and to the proforma invoice in an export or import deal.
Short answer: A purchase order is the buyer's document placing an order with a supplier; a sales order is the seller's internal record confirming it will fulfil that order. In trade, the importer's PO often triggers the exporter's proforma invoice or sales order, and the goods, quantities and prices must stay consistent through to the commercial invoice.
- Purchase order
- Issued by the buyer
- Sales order
- Issued by the seller, confirming the order
- Leads to
- Proforma and commercial invoice
What each document is
A purchase order (PO) is issued by the buyer — it's their formal instruction to purchase specific goods at agreed terms. A sales order (SO) is the seller's internal or external confirmation of that same commitment, generated in response to a PO or a confirmed deal, before it becomes a commercial invoice.
They describe the same transaction from opposite sides. On the import side, your business issues a PO to a supplier. On the export side, a buyer's PO to you is typically what triggers you to raise a sales order or proceed straight to invoicing, depending on your process.
Required fields
A purchase order needs: buyer and seller details, PO number and date, goods description, quantities, agreed unit prices, currency, delivery terms, and expected delivery or shipment date.
A sales order mirrors most of the same fields from the seller's side — often referencing the buyer's PO number directly — plus internal details like expected fulfilment date or the shipment it will be grouped under.
Common mistakes
Treating a PO as equivalent to a proforma invoice — a PO is the buyer's instruction to purchase; a proforma is the seller's preliminary quote. They can precede each other in either order depending on how the deal was negotiated, but they are not interchangeable documents.
Letting quantities or prices drift between the PO, the sales order raised against it, and the eventual commercial invoice without a documented reason for the change.
How they must match the proforma and commercial invoice
Whichever document starts the paper trail — proforma or PO — the sales order and, eventually, the commercial invoice should carry the same goods description, quantities, and agreed pricing forward, unless both sides have agreed to and documented a change.
How Bilexor helps
Bilexor supports both buying-side purchase orders and selling-side sales orders from the same shipment record, so the goods and terms you agree upfront carry through to the commercial invoice without retyping.
Informational only — not legal or contractual advice. For binding commercial terms, confirm your specific PO/SO obligations with your buyer, supplier, or legal counsel.
Frequently asked questions
Is a sales order as legally binding as a purchase order?
Both typically represent a commercial commitment once accepted by both sides, but the specific legal weight depends on your contract terms and jurisdiction — this isn't legal advice, confirm with counsel if a dispute is at stake.
Does Bilexor generate a sales order automatically from a purchase order?
Bilexor supports creating a sales order or purchase order from a shipment record with shared goods and buyer/supplier details, reducing retyping — check the current app for the exact conversion flow.
Sources
- UNECE Recommendation No. 6 — Aligned Invoice Layout Key
Informational only — not legal, banking, tax, or customs advice. Always verify document and LC requirements with your bank, CHA / customs broker, and buyer before presentation.