CII-SR-01:CII namespace declaration required
Cross Industry Invoice must declare RSM namespace.
Engine Classification
Add missing CII namespace declarations to the root element
Confidence: 99% · Applied automatically in pipeline
What is CII-SR-01?
CII-SR-01 is a fatal validation rule defined in the cii-d16b specification. It validates the @xmlns:* element 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: rsm:CrossIndustryInvoice/@xmlns:*
Why This Error Matters
CII requires UN/CEFACT namespaces.
CII-SR-01 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.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Fails CII schema validation
- ·Error returned: CII-SR-01
- ·Specification: cii-d16b
How to Fix It
Add RSM namespace
urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100
Add RAM/UDT
Include component namespaces
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Triggers validation error --> <@xmlns:*></@xmlns:*>
<!-- Corrected --> <@xmlns:*>VALID_VALUE</@xmlns:*>
Technical Reference
rsm:CrossIndustryInvoice/@xmlns:*Common Causes
- ·Missing rsm namespace
- ·Wrong CII version
Seeing this in production? The API handles CII-SR-01 automatically. See the fix response →
Frequently Asked Questions
Cross Industry Invoice must declare RSM namespace.
Add correct CII D16B namespace. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, CII-SR-01 is a critical error that will cause invoice rejection. It must be fixed before submission.
Related Errors
Last updated: 18 February 2026
Handle CII-SR-01 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.