Quoting in SAP Ariba and Coupa: a supplier's checklist before you press submit
Published 2026-11-13 · Istrate Laurentiu, Negotra
More and more B2B customers send requests for quote through a sourcing platform instead of an email. The two you meet most often in Europe are SAP Ariba and Coupa. The screens differ, but the rules they impose on a supplier are similar, and most lost bids are lost on those rules rather than on price. This note collects what the buyers' own supplier guides say, and the pricing decisions worth making before you open the event.
What the platforms enforce
- The closing time is hard. A supplier guide published by the Government of Jersey for SAP Ariba tells bidders to check the event's timing rules for "the validity of event to participate". Philips' Ariba guide is blunter: "After the time of closure, the RFQ event no longer allows you to submit your bid!"
- Price and quantity are mandatory, currency and unit are fixed. In the Jersey guide, Price and Quantity are the required fields; tax, shipping and comments are optional. Philips tells suppliers who answer by email that the price must be in the currency of the buying location and the quantity in the unit of measure of the request, and that neither can be changed.
- Incomplete answers can vanish silently. For email responses, Philips warns that if a required value is missing "your response will not be processed by the system", and that no confirmation or rejection email is sent. It also says the comment field in an email reply is dropped, so a condition written there never reaches the buyer.
- You can revise, but only before the close and only online. In Ariba, "Revise Response" lets you change a submitted bid and submit it again while the event is open (Jersey guide). Philips notes that an email bid can be sent only once; updates go through the Ariba Network interface.
- Coupa works with lots and Excel. Coupa's supplier page explains that in an RFQ the buyer defines the items and lots; the response screen offers Export to Excel, Import from Excel, Save (a draft the buyer does not see) and "Submit Response to Buyer". Coupa recommends filling items and lots offline in Excel and importing them back.
- Questions go through the channel the buyer chose. The Jersey guide asks bidders not to use Compose Message and to reply to the invitation email instead. Check each buyer's instructions; a question sent the wrong way may not be read before the close.
Decide before you open the event
- Your floor per line. Write down the lowest unit price you accept for every item in the event, from cost and minimum margin. Platforms make it easy to undercut yourself line by line, and a bid submitted at a loss is still binding if you win.
- Price in the buyer's currency and unit. Since you cannot change them, convert before you start: a price per box entered against a request per piece is a common, expensive mistake.
- Payment terms and validity. If the event lets you state them, do; if it does not, price the buyer's terms into the unit price. Long terms have a real financing cost; see what 60-day payment terms really cost a supplier.
- Which lots you really want. You do not have to bid on every lot. A lower price on the lots you can serve well usually beats an average price on all of them.
- Lead time. Ariba email responses accept an optional lead time in calendar days (Philips guide). A realistic lead time is part of the offer; an optimistic one becomes a penalty later.
- Room for the next round. Many events have more than one round or a follow-up negotiation. Decide in advance how far you move and in what steps, instead of deciding under the clock.
A short check before you submit
- Every mandatory field filled, every line you bid on priced, totals updated.
- No conditions hidden in fields the platform drops or the buyer never sees.
- Draft saved, then "Submit Entire Response" (Ariba) or "Submit Response to Buyer" (Coupa) actually pressed.
- Closing time noted in your own calendar, with time left to revise.
Where Negotra fits
Negotra is a supplier-side agent that answers buyers' procurement systems on email, SAP Ariba (cXML), Coupa, MCP, A2A and REST. Every offer is checked against cost / (1 − minimum margin), it counter-offers on a concession curve you set and asks a person for approval above your limits. Negotra was tested on 110,000 negotiations against simulated procurement agents; on the 60,000 requests on the demo catalogue it made 0 offers below the floor (figures from negotra.com). These are simulation results on a demo catalogue, not customer results.