What it means
The rule checks that rsm:ExchangedDocument has no direct ram:CategoryCode child. VAT category codes, including BT-118 and BT-151, are separate fields.
Why it matters
This document category field is outside the EN 16931 CII mapping. The invoice type code (BT-3) identifies the document type, such as 380 for an invoice or 381 for a credit note.
How to fix it
Remove only ram:CategoryCode directly inside rsm:ExchangedDocument. Do not remove the invoice type code (BT-3) or VAT category codes (BT-118 and BT-151) to address this warning. Check the updated file again.
Once the file is corrected, check it again for free: Validate an invoice against EN 16931
Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice
The rule as published
CategoryCode should not be present Where this rule applies
| Rule set | Version |
|---|---|
| EN 16931 (CII) | 1.3.17 |
| XRechnung 3.0 (CII) | 3.0.2 |
| NLCIUS (CII) | 1.0.3.13 |
| France CTC (CII) | 1.4.0-04 |
Check your file
Drop your e-invoice to see whether CII-SR-026 still fails, and which other rules do.
Related rules
- CII-SR-027 Remove free-text subjects from invoice notes
- CII-SR-028 Remove content codes from invoice notes
- CII-SR-030 Use at most one text element per invoice note
- CII-SR-032 Remove identifiers from invoice notes
- CII-SR-033 Remove the document effective period from the invoice header
- CII-SR-034 Remove the separate issuer section from the invoice header