Specify fields and evidence
Define supplier, invoice number, date, currency, line items and totals. Keep the source and field location available for review. Mixed Arabic-English layouts require tests for number order and units, not merely readable text.
Validate independently
Recalculate line totals using explicit rounding rules and compare them with the document. Do not let the model invent a missing number to balance the sum. Route unclear currency or unreadable fields to review.
Roll out by format
Start with selected suppliers and formats, tracking correction rates per field. Deduplicate records and keep financial posting reviewable. Expand only after difficult images meet the quality threshold too.