#peppol

The 1 August 2026 Peppol change was narrower than pre-cutover coverage suggested. Two hard cutovers remain — 17 August (BIS 3.0 May 2026 Release mandatory) and 31 August (SML DNS migration). Both are upstream of your local validator. Here's the days-until, the exact failure modes, and the reframe on what actually happened on 1 August.

Your Peppol access point just sent you an MLR rejection. Here's what that means, what the error codes tell you, and how to get your invoice through.

What a Peppol Access Point actually is, what it does on the wire, how SMP/SML discovery works, where the BIS/PINT format split sits, and how the April 2026 G3 PKI cutover changed the operating picture. Written for ERP and B2B SaaS teams deciding whether to operate, buy, or wrap one.

Every EN 16931 validation rule categorized, explained, and cross-referenced. The definitive technical reference for e-invoice developers.

Your invoice just bounced back with a validation error. Here's exactly what happened, why, and how to fix it in minutes.

Belgium's 3-month e-invoicing grace period ended March 31, 2026. Penalties are now active. Here's what changed, what the fines look like, and what ERP vendors need to do right now.

EN 16931 defines ~65 business rules, Peppol adds ~80, and each country CIUS adds more. Here's how the four validation layers work, what they check, and which errors you'll see most.

When a Peppol invoice gets rejected, the cost isn't just the error fix. It's the payment delay, the support calls, and the trust erosion. Here's the full picture.

A practical guide to Schematron validation in EU e-invoicing. Understand the three validation layers, read real rule examples, debug common errors, and see how EN16931, Peppol, and country-specific rules work together.

Belgium's three-month tolerance period for B2B Peppol e-invoicing ended March 31, 2026. Full penalty enforcement is now active. Here's what changed and what ERP vendors need to do.

Belgium's three-month tolerance period for mandatory B2B Peppol e-invoicing ends March 31, 2026. Here's what ERP vendors and their customers need to know about penalties, technical requirements, and what to do now.

Three approaches to e-invoice validation in your pipeline: build your own, use open-source tools, or call an API. Code examples for each.

Belgium requires structured e-invoicing for all domestic B2B transactions since January 1, 2026. Peppol BIS 3.0 is the standard. The grace period ends March 31. Here's what you need.