Operations: fulfilment, packaging & compliance
The first retail purchase order that lands in your inbox looks like a spreadsheet somebody exported by accident. It is not. It is the contract, and almost every term that will decide whether the order makes money is printed somewhere on that one page.
On Amazon an order is a notification. The customer already paid, the price was yours, the shipment is Amazon's problem, and nothing about the transaction is negotiable after the fact. A retail purchase order is the opposite on every axis: it is an offer to buy on stated terms, you accept it by acknowledging and shipping, and the retailer's system will enforce every field on it with arithmetic rather than conversation.
What a purchase order actually is
A PO is a buyer's written offer to purchase specific goods, in specific quantities, at a specific price, delivered to a specific place within a specific window. When you acknowledge it, or when you ship against it, you accept. From that point the document governs.
That matters because acceptance is not only about price and quantity. It carries the ship window, the delivery location, the payment terms, any allowances the buyer has written in, and — by reference — the retailer's vendor agreement and routing guide. The PO is three pages long only if you count the two documents it points at.
The practical consequence for a brand coming from Seller Central is that you cannot fix a problem by adjusting something on your side. There is no seller-side setting. If the case pack on the PO says twelve and you ship six, the receiving system does not see a helpful variation, it sees a discrepancy, and the money comes off the payment.
The fields, line by line
PO number. The primary key for everything that follows. It goes on the carton labels, the bill of lading, the shipping notice, the packing list and the invoice. A shipment that arrives without it cannot be matched to anything and becomes a problem for a person rather than a system.
Order date and ship window. The window is a start and a cancel date, not a deadline with grace. Arriving before the start is as much a violation as arriving after the cancel date, because the DC has scheduled dock and storage capacity for that window. After the cancel date the buyer may legally refuse the goods entirely.
Ship-to and bill-to. Almost never the same address. Ship-to is a distribution center or a specific store; bill-to is corporate accounts payable. Send the goods to the bill-to address and you have shipped to an office building.
DC number or location code. Large retailers run many buildings and the code decides which one. It also decides the routing guide rules that apply, because the same retailer can route differently by facility.
Retailer item number versus your SKU. The retailer assigns its own item number during vendor setup, and that is the number their system thinks in. Your SKU appears, if at all, as a courtesy field. Map the two in your own records on day one, because every later conversation about an item will start with their number.
UPC. The unit-level barcode the buyer expects to scan at the point of sale. It has to be a real GS1 number registered to your brand and it has to match what is physically on the product. Mismatches here are the most expensive kind, because they surface at the store rather than at the DC.
Case pack and inner pack. Case pack is the number of selling units in a shipping case. Inner pack, where it exists, is a smaller sub-bundle inside the case, often the quantity a store will put on a shelf at once. Both are fixed for the life of the item. You do not get to improve them later without a new item setup.
Unit cost and extended cost. The PO states cost per selling unit and multiplies it out. Check the multiplication. Check it against the price you quoted, including whether you quoted delivered or ex-works, because a buyer entering the number from a line sheet sometimes enters the wrong one and the PO is what will get paid.
Terms. The payment terms, expressed as something like net thirty from receipt, sometimes with an early-payment discount attached. This is the field that decides your working capital, and it is worth understanding before you celebrate the order — Amazon payout versus net 30 walks through the cash gap it creates against a settlement cycle you are used to.
Allowances. Line items deducted from the invoice by agreement: a new-store allowance, a marketing or advertising allowance, a defective allowance, a prompt-payment discount. Each is a real reduction in what you will be paid. Add them up and recompute your margin before you accept, because a case that works at full cost may not work after three allowances.
Freight terms. Who pays and who routes. Collect usually means the retailer's carrier on the retailer's account, and it comes with an obligation to use exactly that carrier. Prepaid means you arrange and pay freight and it is already inside your unit cost.
A worked line
Say the PO has one line: a beard oil, retailer item number assigned during setup, case pack of twelve, 240 cases, unit cost 6.25. Extended cost is 18,000 dollars across 2,880 units. Terms net thirty from receipt. Allowances: a new-store allowance on the line, and a defective allowance.
Two things to do before acknowledging. First, confirm you can produce 240 retail-ready cases inside the ship window, which for most brands means the cases already exist rather than being something a factory will make. Second, subtract the allowances from 18,000 and divide by 2,880 to get what you will actually be paid per unit, then compare that to your landed cost plus freight plus a provision for deductions. If the honest number is thin, the time to say so is now, not after the truck leaves.
How do you acknowledge a purchase order?
Acknowledgement is the buyer's confirmation that you will ship what they asked, when they asked. Depending on the retailer it happens in a vendor portal, over electronic data interchange, or in an email reply, and it usually has a deadline of a few business days.
Acknowledge line by line. If you can ship 200 of the 240 cases inside the window, say 200 rather than accepting 240 and shipping short. A quantity you confirmed and then missed is treated far more harshly than a quantity you never confirmed, because the retailer allocated shelf space against your confirmation.
Silence is not neutral. Unacknowledged orders get chased, and some systems cancel them, which is the good outcome — the bad one is that the order stays open and you are measured against a commitment nobody discussed.
What happens if you ship short, early or late
Short means fewer units received than the PO ordered. It creates a fill-rate failure and, where the retailer charges for it, a deduction sized against the missing units. It also quietly damages the number a buyer looks at when deciding whether to reorder.
Early means arriving before the ship window opens. The DC may refuse the truck, or receive it and charge for the inconvenience. Storage and dock time are planned resources.
Late means missing the cancel date. At that point the buyer can refuse the shipment, and you own the freight both ways plus the goods.
Over-shipping is not generous either. Anything above the ordered quantity is unordered product, and it is either refused at the door or received and deducted. Ship exactly what the PO says.
All three land as short-pays on a remittance rather than as emails, which is why the mechanics in retail chargebacks for an Amazon brand are worth reading before your first shipment rather than after your first surprise payment.
Partial shipments, backorders and the PO number
Some retailers allow partial shipments against one PO, some do not, and the PO or the vendor agreement says which. Where partials are allowed, each shipment carries the same PO number and its own shipping notice, and the invoice must match the shipment rather than the order. Where they are not allowed, a partial is a short shipment with a friendlier name.
Backorders behave differently by retailer. Some cancel the unshipped balance automatically at the cancel date, some hold it open. Assume it cancels unless the buyer tells you otherwise, and never assume a balance will be picked up in a later window without written confirmation.
The PO number travels on every downstream document: carton labels, pallet placard, bill of lading, advance shipping notice, packing list, invoice. If any one of them carries a different number or none at all, the retailer's three-way match between order, receipt and invoice fails, and an unmatched invoice does not get paid on time. This is the single cheapest discipline in the whole process and the most commonly broken.
EDI 850, or the portal
Larger retailers transact purchase orders as electronic documents. The order arrives as an 850, you reply with a 997 acknowledgement and often an 855 order acknowledgement, you send an 856 shipping notice before the truck, and you invoice with an 810. You do not need to be able to read the raw files, but you do need to know the numbers, because vendor setup paperwork will ask which of them you support.
Small and mid-size retailers usually offer a web portal instead, where you view the order, acknowledge it, print labels and upload an invoice. Start there if you are given the choice. A portal carries no translation costs and is perfectly adequate until volume makes the manual keying painful.
Vendor Central works the same way for Amazon itself, which is the one place this vocabulary overlaps with something you may already have seen — Amazon Vendor Central purchase orders covers that variant, and the habits transfer directly to a grocery or specialty chain.
Keep a purchase order log
One sheet, one row per PO, maintained by a person rather than a memory. PO number, retailer, DC, order date, window start, cancel date, item numbers, cases ordered, cases acknowledged, cases shipped, ship date, carrier and pro number, invoice number, invoice amount, amount paid, difference, and a note on what the difference was.
That last pair of columns is why the log exists. Without it you will not notice that a payment arrived light, and the dispute window on a deduction is short. With it, reconciliation is fifteen minutes a month and you can answer a buyer's question about last quarter in a single search.
When you are still at the stage of finding the buyers who will issue these orders, paste your listing into WholesalePilot and the preview shows who would plausibly stock the product. Once the first PO arrives, the work described above is the whole job — and the brands that handle it calmly are usually just the ones who read the document before shipping against it.