Self-Contained Invoice Math Verification & Discrepancy Routing

How it works

1. 1.Receive or mock invoice records containing line items, subtotals, tax figures, and metadata.
2. 2.Execute line-by-line arithmetic and mandatory field validation inside a robust JavaScript Code node.
3. 3.Branch the records using an If node into approved or human investigation pathways.
4. 4.Merge streams and compile a single deterministic audit summary report.

Use cases

• Auditing OCR and AI invoice extraction outputs prior to general ledger posting.
• Catching subtle rounding variances and discrepancies in vendor billing submissions.
• Isolating non-compliant invoices missing mandatory Purchase Order (PO) references.

Requirements

• n8n environment version 2.42.6 or higher.
• No third-party credentials required; runs completely offline.

Setup and testing in n8n

1. Import the workflow into n8n and click Manual Demo Trigger.
2. Inspect Audit Math & Fields to confirm calculation checks across lines and totals.
3. Verify that INV-2024-001 passes to Route Approved while INV-2024-002 is flagged to Route Review.
4. Check Compile Final Report to ensure a single structured JSON summary is output matching expected criteria.

Service Value

Ready-made workflow template for automation delivery and service execution.