Purchase order

A purchase order (PO) is a document a buyer issues to a seller to authorize a purchase, specifying the products or services, quantities, prices, and agreed terms. Once the seller accepts it, the PO becomes a binding commitment to buy.

Why it matters in B2B sales

The PO is the buyer's side of the transaction and a key control in corporate procurement: many organizations cannot pay an invoice without a matching PO. For sellers, the arrival of a PO is a strong buying signal and often the formal green light to begin work.

It typically follows an approved sales quote or proposal, so a smooth path from quote to PO is a sign the deal's paperwork is clean. When a PO gets stuck, it is usually because something upstream, a price, a scope line, a code, didn't match what procurement expected.

What a purchase order includes

A PO carries a unique PO number, the buyer and seller details, a description of the goods or services with quantities and agreed prices, delivery details, and payment terms. The PO number is central: the seller must cite it on the invoice so the buyer's finance team can perform the standard three-way match between PO, invoice, and delivery.

Purchase order vs invoice vs sales order

These three are easy to confuse. A PO is issued by the buyer to request and authorize a purchase. A sales order is the seller's internal confirmation that it will fulfill that PO. An invoice, sent later by the seller, requests payment for what was delivered. Together they form the paper trail that keeps procurement and accounts payable in agreement.

A concrete example

After approving a quote, a buyer's procurement team issues a PO referencing that quote, with a unique PO number the seller must cite on the invoice. The seller matches invoice to PO to delivery, the standard three-way match that keeps procurement clean and payment on track.

How it shows up in a modern proposal workflow

A PO is only as clean as the quote and proposal it came from, mismatches upstream become disputes downstream. Cobl keeps line items, pricing, and payment terms consistent from the sales proposal onward, so the buyer's PO matches what was agreed and nothing stalls in procurement.

That alignment means fewer rejected invoices and faster payment, because the numbers the buyer's finance team sees on the PO and invoice trace cleanly back to what sales quoted.