FR-R-004:Chorus Pro engagement number required
French B2G invoices require engagement juridique (purchase order reference).
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Numéro d'Engagement Juridique
What is FR-R-004?
FR-R-004 is a fatal validation rule defined in the factur-x specification (FRA national rules). It validates the ID element under Invoice > OrderReference in the UBL invoice XML.
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.
Target path: XPath: /Invoice/cac:OrderReference/cbc:ID
Why This Error Matters
Required for Chorus Pro routing and payment authorization.
FR-R-004 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
- ·Rejected by Chorus Pro
- ·Error returned: FR-R-004
- ·Specification: factur-x
How to Fix It
Get engagement number
From the public entity purchase order
Add OrderReference
Include cbc:ID with the EJ number
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Missing or empty element triggers cbc:ID error --> <cbc:ID></cbc:ID>
<!-- Provide the required value --> <cbc:ID>VALID_VALUE</cbc:ID>
Technical Reference
XPath: /Invoice/cac:OrderReference/cbc:IDCommon Causes
- ·Missing EJ number
- ·Wrong reference field used
Seeing this in production? The API handles FR-R-004 automatically. See the fix response →
Frequently Asked Questions
French B2G invoices require engagement juridique (purchase order reference).
Add OrderReference with engagement juridique number. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, FR-R-004 is a critical error that will cause invoice rejection. It must be fixed before submission.
See Also
Related Errors
Last updated: 27 February 2026
Handle FR-R-004 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.