Invoice Validation Assistant Starter Kit: CSV Pre-Payment Exception Checker

Catch invoice exceptions before payment.

Invoice Validation Assistant Starter Kit checks invoice, purchase order, vendor alias, and historical paid invoice CSV exports before a payment run. It flags possible duplicate invoices, missing POs, amount mismatches, closed POs, vendor mismatches, department mismatches, currency mismatches, and invoices that resemble previously paid items.

It checks:

- possible duplicate invoices in the current payment batch

- possible matches against a historical paid invoice list

- missing PO numbers

- PO numbers that are not found in the purchase order export

- invoice amounts above approved or received PO values

- closed POs receiving new invoices

- vendor, department, and currency mismatches

Included in the download:

- Python invoice validation script

- sample invoice and purchase order CSVs

- sample vendor alias and historical paid invoice CSVs

- sample custom-column mapping file

- alternate-column sample files for mapping tests

- configurable rules file

- user guide

- buyer fit checklist

- column mapping quickstart

- demo walkthrough

- sample CSV, Excel, JSON, and HTML output reports

v1.4 adds an Excel workbook output and alternate-column sample CSVs, so buyers can test both review output and custom field mapping without preparing their own fake files first.

This is a Starter Kit, not a hosted AP automation platform. It does not connect to your ERP, bank, card, or payment gateway. Buyers should be comfortable running a Python script locally or adapting CSV exports into the sample format.

Risk boundary: This product is a validation assistant, not a replacement for accounting controls, ERP approval workflows, professional audit judgment, or source document review. It does not guarantee detection of every duplicate payment, fraud case, or accounting error.