Purchase Order (PO)

A purchase order (PO) is the document a buyer sends to a supplier to authorize and formalize the purchase of products or services. It specifies what is being bought, in what quantity, at what price, under what payment and delivery terms, and under which reference number. Once the supplier accepts it, it stops being an intention and becomes a binding contractual commitment between both parties.

In the administrative workflows of Argentine and Latin American companies, the purchase order is the piece that anchors the entire purchasing cycle (procure to pay): it starts from an internal requisition, enables receipt of the goods and, later, serves as the reference for validating the supplier's invoice. Without a prior purchase order, many companies authorize neither the receipt of goods nor payment.

That is why it is one of the documents processed and matched in accounts payable, part of what Arconte digitizes and reconciles within the financial workflow.

The purchase order serves a purpose that goes far beyond paperwork: it is the control mechanism that separates what a company decided to buy from what it actually receives and pays for. By issuing a purchase order before the goods arrive, the organization records an approved commitment that can later be audited, budgeted and checked against actual spend.

What information a purchase order contains

Although the format varies from company to company, a complete purchase order usually includes:

• A unique order number that identifies and tracks the transaction throughout its cycle
• Buyer and supplier details (legal name, tax ID such as the CUIT in Argentina, address)
• Line-item detail: description, code or SKU, quantity and unit price
• Total amount, applicable taxes and currency
• Commercial terms: payment method and terms, place and date of delivery
• Terms and references to the quotation or contract it originated from

Sample purchase order with example data

This is what a complete purchase order looks like, using the Rosario example that appears further down. The values are illustrative: the point is that every field has an owner and a verifiable piece of data.

How it fits into the purchasing cycle

The purchase order is the central link in a chain that brings order to company spending. The typical path, step by step:

1. Internal requisition: a department identifies a need and asks purchasing for it.
2. Quotation: purchasing requests a quotation from one or more suppliers and chooses one.
3. Issue and approval: the purchase order is issued and signed by whoever is authorized for that amount.
4. Supplier acceptance: the supplier confirms it and, from then on, the order is a commitment for both parties.
5. Receiving: the warehouse receives the goods and records what arrived against the delivery note.
6. Invoice and control: the supplier sends its commercial invoice, which is matched against the order and the receipt.
7. Payment: if the three documents agree, accounts payable releases the payment.

That final match has its own name: the three-way match, the control that verifies that the purchase order, the receipt and the invoice agree on quantities and amounts before payment is released. It is the main defense against duplicate payments, overbilling or goods that never arrived.

Why it matters for control and finance

A well-managed purchase order gives the company traceability and predictability. It shows how much spend is committed even if it has not been invoiced yet, organizes approvals by authority level (a manager signs up to a certain amount, a director above it), and prevents informal purchases that later show up as surprise invoices. At the accounting close, open orders feed the estimates of liabilities and accruals.

A concrete example

A Consumer Goods distributor in Rosario needs to restock 5,000 units of a product. The warehouse supervisor creates a requisition; purchasing requests quotes from three suppliers and chooses the one with the best price and lead time. It issues purchase order No. 4821 for those 5,000 units at an agreed price, with delivery in 10 days and payment net 30 from the invoice date. When the truck arrives, the warehouse receives only 4,800 units and records that. A few days later the supplier's invoice arrives for 5,000. The three-way match catches the difference: the invoice is not paid in full until the 200 missing units are resolved. Without the purchase order as a reference, that discrepancy would have gone unnoticed.

Common mistakes

• Accepting an invoice with no prior order ("off-process" purchases), which breaks control and makes spend hard to audit
• Not updating the order when agreed quantities or prices change, creating mismatches with the invoice
• Confusing the purchase order with the invoice: the buyer issues the order to request; the supplier issues the invoice to get paid
• Approving without respecting authorization levels, weakening internal control

Purchase order vs invoice: how they differ

They are the two documents most often confused, but they play opposite roles in the transaction:

Digitizing purchase orders and reconciling them against receipts and invoices is, in practice, where companies recover the most time and reduce errors in accounts payable, especially as the number of suppliers grows and manual matching stops scaling.