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 See how Strata works

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.