Invoice matching issues and how to fix each one
The six ways a three-way match breaks — duplicate invoices, phantom vendors, price drift, quantity gaps, substitution fraud, and statement mismatches.
Matching fails in a handful of recurring ways. A restaurant that can name which failure it is looking at fixes it in minutes; one that cannot re-litigates every month. The six modes below cover nearly everything seen in independent restaurant purchasing, ordered roughly by frequency.
The six failure modes
- Duplicates. Same invoice paid twice — often via both paper and email copies. Fingerprint on supplier + date + amount.
- Phantom vendors. Invoices from 'suppliers' with no deliveries behind them. This is fraud territory; check new vendors against goods-received records.
- Price drift. Unit prices quietly above contract. Visible only when compared per unit against agreed terms.
- Short deliveries. Compare accepted counts or weights with the order and invoice. Record the shortage at receiving and request a correction within the agreed dispute window.
- Unapproved substitutions. Compare the delivered product and specification with what was ordered and billed. Record any approval and challenge a premium price for a different product.
- Statement mismatches. Reconcile the supplier statement with booked invoices, payments and credits. Investigate missing or duplicated entries before paying the balance.
A worked example
Month-end across 38 invoices: two duplicates (€212), one vendor never received goods for 3 invoices (€447), four lines above contract price (€61), one short delivery uncredited (€34), salmon invoiced as wild-caught but delivered farmed (€89 spread), and €128 of invoices missing from the supplier's statement.
| 2 duplicate payments | €212.00 | recoverable via credit |
|---|---|---|
| 3 phantom invoices | €447.00 | fraud — escalate immediately |
| 4 drifted lines | €61.00 | renegotiate at next review |
| 1 short delivery | €34.00 | dispute window still open |
| substituted salmon | €89.00 spread | specification breach |
| statement gap | €128.00 | reconcile before paying |
€971 of exposure in an ordinary month — and five of the six findings came from checks costing minutes, not days.
Interactive example · price spread
Spread between your highest and lowest quoted unit price: €6.30 (€39.90 → €46.20). Compare the quoted prices with each supplier. This is a price difference, not a savings projection.
Building the controls
- 1Fingerprint every invoice. Supplier + date + total catches duplicates automatically. Manual matching misses them because paper and PDF versions look different.
- 2Verify before first payment. New vendor = check goods-received notes exist. Thirty seconds per new payee closes the phantom-vendor door.
- 3Compare units, not totals. Contract compliance lives at per-unit level. Total-based reviews miss systematic drift under noise.
- 4Reconcile statements monthly. The supplier's own statement is free evidence. Gaps between your books and their statement point at both directions of error.
FAQ
- Is three-way matching realistic without software?
- Partially. PO-to-invoice comparison is feasible manually for small volumes; per-line price checking against contract terms does not survive scale or fatigue. That per-line automation is Comandero's core job.
- What distinguishes error from fraud?
- Intent, mostly — which you infer from pattern. Repeated phantom invoicing or consistent substitution is not sloppiness. Documented patterns justify escalation beyond accounts payable.
- How fast should disputes be raised?
- Within 48 hours for quantity issues while delivery memories are fresh; pricing disputes can follow the monthly cycle. Later than that and credit rates drop sharply.
- Which suppliers cause most matches?
- Usually the highest-volume ones — not from bad faith but transaction count. Prioritize controls where volume concentrates.
Keep reading
- A 15-minute invoice review that catches what audits miss
Five checks, in order, that surface pricing errors before they reach your books.
- Sharing invoice data without sharing what shouldn't leave the building
What to strip before invoices go to advisors, benchmarking services, or AI tools — and how to keep a redacted copy that still answers purchasing questions.
- Catch invoice line-price drift before it eats your margin
Compare each invoice line against expected unit prices and act on real variances, not noise.
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