Source-to-Settle (S2S)
Source-to-Settle (S2S) is the end-to-end procurement cycle, from sourcing a supplier through to settling the money owed to them. It covers the same ground as source-to-pay, but is named from the finance side: the emphasis falls on the tail of the process, where the invoice is received, matched, approved, settled and reconciled, and the commitment is finally cleared from the ledger.
The cycle runs: spend analysis and supplier discovery → qualification and screening → RFQ or tender → quotation comparison and award → contract or price agreement → requisition → budget check and approval → purchase order → goods receipt and quality approval → supplier invoice → three-way matching → payment and reconciliation. The distinction that matters is the last step. A process that stops at "payment released" has not closed anything; a settle-oriented process is only complete when the payment has cleared, the supplier ledger agrees, and the accrual raised at receipt has been reversed.
Organisations adopt the source-to-settle framing when procurement and accounts payable have been running as separate functions and the seams between them are causing problems — invoices that cannot be matched because the receipt was never posted, accruals that persist for months because nobody closed the PO, payments made against superseded quotations. Running the whole span in one system removes those seams, because the same purchase order that finance sees as a commitment is the one the storekeeper receives against and the one the matching engine checks the invoice on.
The difference between source-to-pay and source-to-settle is where you consider the job finished. Releasing a payment is not the same as settling one — the cash still has to clear, the supplier ledger still has to agree, and the accrual raised when the goods arrived still has to be reversed. Teams that measure themselves on invoices approved rather than commitments closed end up with a month-end full of open POs and unexplained accruals, which is exactly what the settle framing is meant to prevent.
screen supplier
& award
& approval
& stores
& settle
A shipyard buying class-approved plate for a newbuild block. The production plan raises a requisition against the project budget. In the WHIZERP eProcurement module the buyer issues one RFQ to a shortlist of qualified mills, and quotations return into the same system rather than into an inbox.
Screening the supply base. Qualification is where marine procurement usually loses days. WHIZAI reads the documents each supplier submits — trade licence, ISO certification, class approval, insurance, bank details — checks them for validity and expiry, and scores the supplier against its own history in the system: on-time delivery, quality rejection rate, price variance against past awards, and outstanding non-conformances. Missing or expired certificates, duplicate bank details and vendors with an open quality hold are flagged before the RFQ goes out, so the shortlist is built in minutes from evidence rather than assembled by hand from email threads.
Comparing quotations on more than price. Returned quotes are normalised onto one comparison sheet — price converted to a common currency and Incoterm, lead time against the block erection date, and the technical parameters that actually decide acceptance in a shipyard: material grade and specification, EN 10204 3.1 or 3.2 mill certificates, class society approval, and any project-specific quality parameters. A quote that is cheapest per tonne but carries the wrong certificate is not the cheapest quote, and the comparison shows that plainly instead of leaving it to be discovered at inspection.
Order, receipt and settlement. The award converts straight to a purchase order — no re-keying — after an automatic budget check against the project and a value-based approval route. On delivery, stores post the goods receipt and QC records a separate quality approval against the certificate held on the order; material that fails inspection is quarantined and never reaches stock or the matching queue. The supplier invoice is then three-way matched against that PO and receipt within defined tolerances, released for payment, and the project accrual reversed — closing the commitment on the newbuild cost sheet in the same system that raised it.
What is source-to-settle?
The end-to-end procurement cycle from sourcing and qualifying a supplier through RFQ, award, purchase order, goods receipt and three-way matching, to settling the invoice and reconciling the ledger.
What is the difference between source-to-settle and source-to-pay?
They describe the same span of activity. Source-to-settle is the finance-side name, stressing that the cycle closes only when the payment has cleared and the commitment has been reconciled — not when the invoice is approved for payment.
How does source-to-settle differ from procure-to-pay?
Procure-to-pay begins at the requisition. Source-to-settle begins earlier, with spend analysis, supplier discovery, qualification, RFQ and contracting, and ends later, with settlement and reconciliation.
Why does source-to-settle matter in shipyards and marine construction?
Because acceptance depends on more than price. Items must match a specified material grade, carry the right mill or class certificate, and pass inspection before they can be used on a class-surveyed structure — so quotation comparison, goods receipt and quality approval all have to check certificates and quality parameters, not just quantities. Costs also have to settle against the right project or block, which requires the procurement and project ledgers to be the same system.