BR-BE-12:Mercurius endpoint format
B2G invoices to Belgian government must use the correct Mercurius endpoint format. The endpoint ID must be a valid Mercurius identifier.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Mercurius Endpoint ID
What is BR-BE-12?
BR-BE-12 is a fatal validation rule defined in the Mercurius specification (BEL national rules). It checks whether mercurius endpoint format.
When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.
Why This Error Matters
BR-BE-12 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: BR-BE-12
- ·Specification: Mercurius
How to Fix It
Technical Reference
Code Example
<cbc:EndpointID schemeID="0208">0123.456.789</cbc:EndpointID>Common Causes
- ·Using wrong scheme ID for Belgian government
- ·Endpoint identifier not from Mercurius system
- ·Outdated government endpoint
Seeing this in production? The API handles BR-BE-12 automatically. See the fix response →
Frequently Asked Questions
B2G invoices to Belgian government must use the correct Mercurius endpoint format. The endpoint ID must be a valid Mercurius identifier.
Use the proper Mercurius identifier from the Belgian government portal. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, BR-BE-12 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.
Many instances of BR-BE-12 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including mercurius endpoint format.
Last updated: 18 January 2026
Handle BR-BE-12 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.