A detection engine that shows its work.

Duplicate invoices

Exact matches use supplier, document number, currency, and total. Probable matches use supplier, amount, and currency within three days, with different document numbers.

• Exact and probable match classes
• Separate duplicate payment checks when payment evidence exists
• Repeated imports do not create repeated findings

A duplicate invoice record does not prove the supplier was paid twice. Payment evidence is required for that claim.

Supplier price changes

The same supplier, item description, and currency are compared across confirmed price rows.

• Previous price, current price, and absolute change
• Percentage change with comparison dates
• A minimum 5% and 0.01 increase before a finding is saved

A price increase is not automatically a financial loss. Quantity data determines whether an impact can be estimated.

Unusual expense amounts

Confirmed invoice, receipt, and expense amounts are compared with the same supplier's history in the same currency. A finding requires at least eight rows, an amount above the upper fence (third quartile + 1.5 × interquartile range), and at least twice the supplier's median.

• The rule, supplier median, quartiles, and flagged row are shown
• A minimum of eight confirmed rows prevents noisy flags
• No savings estimate is made because the correct amount is unknown

An unusual expense is not proof of fraud or an incorrect payment. It is a reason to look closer.