The procurement cycle — five documents and a three-way match

A mid-sized contracting company I worked with was spending about 80% of project budget on materials while its competitors were bidding the same work at nearer 60%. The finance director could see the number and could not see the cause, because there was no document anywhere in the company that named it. Margin was leaving the business before a single invoice was raised.

Nothing was being stolen in any dramatic sense. The company simply had no procurement cycle, and a company without one pays whatever the supplier decides to charge.

What was actually happening

Four steps, each reasonable on its own, adding up to an open till.

A site engineer phones a supplier he has used for years: five tonnes of rebar, today, the site is standing idle. No paperwork, because the site is standing idle. The supplier delivers and prices it roughly 10% above the market, which he can do because he knows there was no alternative quote and no time to get one. The storekeeper takes delivery verbally and records nothing, because he is busy. At month end the supplier’s statement arrives, the accountant asks the engineer whether the material came, the engineer says yes it did, and the cheque goes out.

Every person in that chain acted in good faith. The company still had no price competition, no receiving record, no way to reject damaged goods after the fact, and no way to tell an overcharge from a fair charge.

The five documents

The fix was not new staff. It was five documents, in a fixed order, with a different person owning each.

Five documents, in a fixed order

1. Purchase requisitionAn internal statement of need, approved electronically. Declining here is the cheapest saving available, because no supplier yet knows there is demand.
2. Request for quotationThe same specification to three registered suppliers. The winner knows he was one of three, and prices the next round accordingly.
3. Purchase orderThe legal contract — quantity, price, delivery date, payment terms. No goods enter the warehouse without its number.
4. Goods receipt noteThe quantity that actually arrived, recorded by the warehouse. Excess is refused, damage is a rejection, and the liability never forms.
5. Supplier invoicePaid only when the three-way match agrees: what was ordered, what was received, what is being billed.

Each document constrains the next. Skip to the third and the discrepancy surfaces at the fifth — after the money has left.

1. Purchase requisition

An internal document. An employee states a need. Nothing has been ordered and nobody outside the company has been contacted.

The rule: no purchase without an approved requisition. In practice the site engineer raises it from his phone, five tonnes of rebar, and it routes to the project manager for electronic approval. If the project manager declines, the cycle ends there and the money is never spent. That is the cheapest possible saving and it happens before any supplier knows there is demand.

2. Request for quotation

An invitation to suppliers to price the requirement. Instead of one phone call to one supplier, the system sends the same specification to three registered suppliers and collects three answers.

The arithmetic is unremarkable and the effect is not. Supplier A quotes 100, supplier B quotes 95, supplier C quotes 110. You take the best on price and technical fit, and — more importantly — supplier B now knows he was one of three. He prices the next round accordingly.

3. Purchase order

The legal contract, and the document that protects you. It states quantity, price, delivery date and payment terms, and once it is issued the supplier is bound to that price.

The rule: no goods enter the warehouse without a purchase order number. That single rule is what makes every later control possible, because it gives the receiving step something to check against.

4. Goods receipt note

The actual quantity that arrived, recorded by the warehouse rather than asserted by the buyer.

The storekeeper sees on his screen that five tonnes are expected against a live purchase order. If six arrive, the system refuses the excess rather than absorbing it quietly. If the material is damaged, the receipt is recorded as a rejection and the liability never forms. What this step delivers is the property that no manual process ever achieves: the physical warehouse and the digital warehouse agree, item by item.

5. Supplier invoice and the three-way match

The accountant does not pay because an invoice arrived. The system runs an automatic comparison first.

Three questions, and all three must agree:

1. What did the purchase order commit to?
2. What was actually received on the goods receipt note?
3. What is the supplier invoicing for?

Quantity and price both have to reconcile across all three. If they do, the payment is released. If any of them differs, by any amount, the system holds the payment and raises an exception for a human to resolve.

That is the whole control. It is unglamorous, it is decades old, and it is the single most valuable thing an ERP does for a company that buys physical goods.

What changed

Material cost fell about 12% in the first quarter, almost entirely from the quotation step: three prices instead of one. The disappearance of unexplained stock differences came from the receiving step, because nothing could enter or leave without a document behind it.

Neither result required a person to behave better. Both came from the process refusing to proceed without the previous document.

Three things that decide whether this works

Segregate the duties. The person who requests the goods must not be the person who receives them, and neither may be the person who pays for them. Three roles, three people. On a system this is a permissions configuration that takes an afternoon; without a system it is an honour code. Where a small company genuinely cannot staff three separate roles, the compensating control is a second approval on payments above a stated threshold, written down and reviewed.

Do not run a quotation round for everything. Printer toner and cleaning supplies do not need three quotes every month. Put recurring low-value items on a blanket order with an agreed price for the year and draw against it. Applying the full five-step cycle to a box of pens is how a control gets abandoned: people bypass processes that waste their time, and once they bypass one they bypass the rest.

Master data first, or none of it holds. Duplicate supplier records mean spend analysis is fiction, because one supplier appears three times and none of the three looks large. Items defined without a correct unit of measure mean the three-way match compares tonnes against kilograms and either blocks valid invoices or passes invalid ones. This is the least interesting part of the project and the part that decides it, which is covered further in which modules you actually need.

Where this cycle touches the others

Procurement creates the liability and brings cost into the business. What happens to that cost after receipt — how it is valued, and what it does to margin — is the inventory and costing cycle. Where the resulting supplier payment lands in the accounts, and how it closes at month end, is the ledger and the close.

If you are working through the field in order, the full sequence is on the learn ERP page, and the definition it starts from is what an ERP actually is.

For anyone evaluating products: ask the vendor to demonstrate a three-way match failing. Any product can show one succeeding. Watch what the system does when the invoice is 3% over the purchase order — whether it blocks, who it notifies, and whether the tolerance is configurable. The systems comparison covers where each product’s purchasing module stops.