AIdaptIQBY NUMBER7 AIOpen AIdaptIQ ↗Book a demo →

Invoice Error Lab

Read the bill. See what went wrong and what to do next.

Download all examples ↓

Original PDFs, invoice checks and clear next steps.

1 / 10

INVOICE ARITHMETIC

A misplaced decimal changes the bill

A $1,250.00 subtotal has been read as $125.00 in the incorrect extraction.

Difference in this example

$1,125.00 understated
Incorrect extraction$250.00
Source total$1,375.00

Next: Resolve the extraction against the original source, then complete the required review.

Inspect the calculation or change the amounts

5 × $250.00 = $1,250.00; + $125.00 tax = $1,375.00.

The deliberately incorrect extraction total is $1,125 below the original invoice total.

  1. 01

    Read the original line: 5 units × $250 = $1,250.

  2. 02

    The incorrect extraction moves the subtotal decimal and reports a $250 total.

  3. 03

    Add the source’s $125 tax to reach $1,375. Resolve the extraction against the original invoice.

CALCULATED FROM THE EXAMPLE

The entered total needs attention.

Subtotal from lines
$1,250.00
Taxable base
$1,250.00
Calculated tax
$125.00
Calculated total
$1,375.00

The example's entered subtotal and total do not match the line quantities and prices.

A calculated relationship is a check on the inputs. It does not establish vendor identity, tax policy, approval or accounting acceptance.

Editing these inputs changes the browser check; it does not change the original PDF. These examples tax subtotal minus discount plus charges, round tax once to the nearest cent and use whole-number quantities. Apply your own accounting policy in a real workflow.

Line quantities and unit prices
Adjustments defined by the example
Entered extraction values to check

02 / MIXED-VENDOR DOCUMENTS

LAB-107 is a separate office invoice.

A page-by-page split would break the freight invoice. Treating the whole PDF as one record would combine two invoices and a credit note. Identify the document boundaries first.

Page 1 belongs to LAB-107. Pages 2–3 form one freight invoice; page 4 is a credit note.

Page 1LAB-107$480.00 invoicePages 2–3LAB-108One $348.00 invoicePage 4LAB-109−$48.00 credit note
Read the full document boundary map
Document boundaries in the four-page bundle
Bundle pagesDocumentVendorExpected treatment
Page 1LAB-107Summit Office SupplyOne invoice · 1 source page · $480.00
Pages 2–3LAB-108Westbridge LogisticsOne invoice · 2 source pages · $348.00
Page 4LAB-109Summit Office SupplyCredit note referencing LAB-107 · −$48.00 accounting amount

03 / CLIENT CODING CONTEXT

Harbor Retail · delivery expense.

Both bills come from Westbridge Logistics and describe freight. Each client has its own accounting policy. Select a client to inspect the treatment for its book.

CLIENT ACCOUNTING POLICYDelivery expense

Client 014 · Harbor Retail. The other client’s treatment is not applied to this book.

Compare both client examples and sources
CLIENT 014

Harbor Retail

Recurring vendor: Westbridge Logistics.

Client accounting policy: Delivery expense.

Download source PDF ↓
CLIENT 042

Pinehill Manufacturing

Recurring vendor: Westbridge Logistics.

Client accounting policy: Cost of goods sold.

Download source PDF ↓

04 / PARTIAL RECEIPTS AND CUMULATIVE BILLS

LAB-110 needs 20 units resolved.

The PO covers 500 units. Two receipts add 300 and 150 units; a correction removes 20, leaving 430 received. An earlier invoice consumed 250 units. The current 200-unit invoice brings billing to 450, exceeding receipt evidence by 20 units. This example assumes zero quantity tolerance.

RUNNING BALANCE

20 units need receipt or invoice resolution.

Received after correction
430 units
Previously billed + current invoice
450 units
Unsupported quantity
20 units
Remaining PO quantity to bill
50 units

Hold the unsupported quantity while the receiving or invoice owner resolves the evidence.

A passed quantity check still leaves the configured review and approval steps. This checker does not perform value, price or tax matching.

Inspect the receipt ledger or change the quantities

Receipt evidence300 + 150 − 20 = 430 units

Cumulative billing250 + 200 = 450 units

Use the document selector to inspect the PO, receipts and correction ledger. Changing these values affects this browser check only.

Download the current invoice ↓Download the PO, receipts and correction ↓

05 / INVOICE-LINKED EMAIL

LAB-113 needs a project code.

Your clients can answer from their inbox. Your team keeps the conversation on the bill. In AIdaptIQ, email participants do not need a platform seat and their replies automatically update the invoice workflow.

  1. Question · LAB-113

    “Which project should this freight bill use?”

  2. Client reply · same bill

    “Use the North site project.”

  3. Next decision

    Keep the answer and earlier conversation on LAB-113. Continue with configured review and approval.

EXAMPLE STATE: Waiting for client clarification

This button changes the worked example; it does not send an email.

Download source PDF ↓Explore email-based AP collaboration →See the reviewer workbench →Watch invoice-linked email collaboration ↗
All 10 examples and source files

06 / USE THE SAME INPUTS

Bring the original documents to the evaluation.

  1. Download the pack and keep the source invoices unchanged.
  2. Open the expected-answer JSON or CSV to establish the document boundaries, amounts and example context.
  3. Run the files through the product you are evaluating and record its actual output.
  4. Count manual preparation, corrections, questions and review effort alongside accepted accounting results.

The pack includes invoice errors, checked answers and the client policies used in each scenario. Run the same PDFs through each product and compare its output with the answers, then repeat with your own documents.

Download all source files and answers ↓See AIdaptIQ on your invoice batch →
About the examples and checks

QUICK ANSWERS

About the examples and checks.

What is the Invoice Error Lab?

The Invoice Error Lab is a free collection of invoice examples, original PDFs and browser-based arithmetic and quantity checks. Use it to explore invoice errors, multi-page document boundaries, client coding context, partial receipts and email clarification before evaluating a live AP workflow.

Are these live AIdaptIQ processing results?

The Lab lets you inspect sample PDFs and calculate invoice amounts and receipt balances in your browser. To see AIdaptIQ process your own documents, request a workflow assessment.

Can I download the sample invoices without signing up?

Yes. The PDF source files, extraction errors and checked answers are available without registration.

Does the lab upload or store my invoices?

The lab has no document-upload feature. Calculator values stay in the page and are not included in its analytics events.

Published 8 October 2026 · Number7 AI · Invoice examples and checks.

Request the diagnostic→