Each VAT breakdown category code must be one of the recognised EN16931 VAT category codes.
Why Factur-X / CII invoices fail rule FX-VAT-001 (ERROR) and how to fix it: Each VAT breakdown category code must be one of the recognised EN16931 VAT category codes.
What this rule checks
Each VAT breakdown category code must be one of the recognised EN16931 VAT category codes.
Affected element: Vat › CategoryCode.
Standard: EN 16931 / Factur-X (CII). Severity: ERROR.
Why your invoice is rejected
e-Invoicing platforms and buyers validate EN 16931 business rules after the XSD check. When this rule fails the invoice is rejected — even if the XML is otherwise well-formed — so it must be fixed before you send it.
How to fix it
Review Vat › CategoryCode against the rule constraint and correct the value where it is violated.
Verify before you send
Upload your Factur-X / CII invoice to the validator to confirm this rule — and every other EN 16931 business rule — passes before your buyer or platform sees it.