Production issues in e-invoicing often come from scenarios that were never exercised before launch. A useful test plan should go beyond happy-path sending and cover how the whole document flow behaves under realistic conditions.

What to include in testing

A strong test set usually covers:

  • valid invoices
  • invalid data and failed validation
  • receiver publication and identifier checks
  • missing references
  • attachment handling
  • support and retry workflows

This helps teams evaluate not just whether the integration works, but whether the product is ready for production support.

What teams often skip

Common gaps include:

  • unclear ownership during failed tests
  • no review of customer-facing error messages
  • no proof that the right participant ID and receiver setup are being used
  • no checks for downstream operational visibility

Those gaps become expensive after go-live because they turn simple issues into support escalations.

The practical goal

Testing should prove three things:

  1. documents can move correctly
  2. failures are understandable
  3. support can resolve problems without engineering involvement in every case

For rollout preparation, read How to check if a company is on Peppol , How long does Peppol onboarding take? , How supplier onboarding for Peppol actually works , and How to plan a Peppol rollout without creating ops debt .