---
title: "Check invoice lines against the agreed rate | Certant"
description: "Certant puts a disputed invoice line beside its purchase-order line and fee schedule, with the page behind each figure, ready for a reviewer."
url: "https://certant.ai/use-cases/invoice-exception-review"
---

For accounts payable and finance managers

# Check invoice lines against the agreed rate

Certant puts a disputed invoice line beside its purchase-order line and fee schedule, with the page behind each figure, ready for a reviewer.

[See it on your documents](https://certant.ai/contact-sales?topic=use-case) [See how Strata works](https://certant.ai/strata)

Built with you and tested on a sample of your own invoices first.

Invoice INV-8842 · line 3Example

Invoiced at **$1,480 a day**. The rate schedule says **$1,350**.

Rate differs Invoice INV-8842 · page 1 Rate schedule 2026 · table 2 · page 4

_The disputed line and the agreed rate, each with its page._

The problem

## The agreed rate is somewhere else

An invoice arrives with a day rate that looks high. The purchase order shows one figure and the fee schedule attached to the contract shows another, so the reviewer opens all three documents to see which is right.

That's three documents for one line, and a month's invoices have hundreds of lines.

The documents

## What Certant reads

Each line is compared with the schedule in effect on its service dates.

| Document | What it supplies |
|---|---|
| Invoices | Each line: description, quantity, rate, amount and the order it quotes. |
| Purchase orders | The line that was ordered, with its quantity and rate. |
| Fee and rate schedules | The agreed rate for each role or item, and the date it applies from. |

The result

## Read the three lines together

Invoice INV-8842, Oakfield EngineeringExample

### Main comparison, line 3

Invoice line 3

Senior technician

**Quantity**

6 days

**Rate**

$1,480

**Amount**

$8,880

Invoice INV-8842 · page 1

Order line 2

Senior technician

**Quantity**

6 days

**Rate**

$1,350

**Amount**

$8,100

Purchase order PO-5531 · page 1

Rate schedule

Senior technician

**Quantity**

per day

**Rate**

$1,350

Rate schedule 2026 · table 2 · page 4 · from 1 Jul 2026

**Matched on**

order number PO-5531 · role "Senior technician" · service dates 12 to 19 Oct 2026

**Disputed value**

$130 a day, $780 on the line

### Other lines on the invoice

| Invoice line | Description | Amount | Verdict |
|---|---|---|---|
| 1 | Site supervisor, 2 days at $1,620 | $3,240 | Matches the order and schedule |
| 2 | Travel | $412 | No matching order line |
| 3 | Senior technician, 6 days at $1,480 | $8,880 | Rate differs |

_The match keys are shown so the reviewer can see why these three lines were put together._

The review

## The reviewer gets an evidence pack

Certant assembles the three lines, the match keys and the source pages into one pack and proposes a next step, such as a query to the supplier. An accounts payable reviewer decides what happens.

Certant doesn't approve, hold or release a payment.

Proposed next stepExample

**Pack**

invoice page 1, order page 1, rate schedule page 4

**Proposed**

Query the supplier about line 3 and ask which order covers the travel on line 2.

Waiting for review · Accounts payable

Scope

## What setup involves

This is a custom workflow. We build it against a representative set of your invoices, purchase orders and schedules, and you judge the results on that set before going further.

| Area | What to expect |
|---|---|
| Matching | Lines join on keys agreed with you, such as order number, description and dates. Lines with no match are listed as unmatched. |
| Systems | It starts from documents and exports. Connecting your accounting system is implementation work, scoped for each deployment. |
| Judgement | It's a review aid. It doesn't give tax advice, and it won't catch every error in every invoice. |

Related

## Related use cases

### Supplier SLA monitoring

Reported supplier performance beside the contract's service levels.

[See the use case](https://certant.ai/use-cases/supplier-sla-monitoring)

### Warranty recovery review

Recorded failures that may fall inside a documented warranty.

[See the use case](https://certant.ai/use-cases/warranty-recovery-review)

### Payroll agreement checks

Each pay rate beside the minimum in your enterprise agreement.

[See the use case](https://certant.ai/use-cases/payroll-agreement-checks)

[See all use cases](https://certant.ai/use-cases)

## Test it on real invoices

Send us a batch of invoices with their orders and rate schedules. We'll show you the lines that differ and the pages behind them.

[See it on your documents](https://certant.ai/contact-sales?topic=use-case) [See how Strata works](https://certant.ai/strata)

Strata is a paid add-on for the Business plan and above. Certant Cloud, your cloud, or fully air-gapped.