What does CII-SR-454 mean?
An invoice line (BG-25) contains more than one VAT information group (BG-30); exactly one is allowed.
Classification: Format error. This group covers missing mandatory data, codes or formats that are not allowed, and deviations from the XML structure.
A violation of this rule means the file does not meet the technical standard at this point. The check does not judge whether the invoice is correct in substance. The file should be corrected by the invoice issuer.
Which invoice fields are concerned?
The rule text names these EN 16931 business terms (BT) and groups (BG):
- BG-25
- BG-30
Who has to correct the error?
As a rule the invoice issuer, i.e. your supplier or its invoicing software: only the issuer can generate the e-invoice again. Do not edit the file you received; keep it and ask for a corrected e-invoice. Our knowledge article explains how to handle a faulty XRechnung overall.
E-mail to the supplier
Copy the template, add the invoice number and date, and send it to your supplier's accounts department.
Subject: Request for a corrected e-invoice (rule CII-SR-454) Dear Sir or Madam, When we checked your e-invoice [invoice number] dated [date], the KoSIT validator reported a violation of rule CII-SR-454 of EN 16931 / XRechnung: An invoice line (BG-25) contains more than one VAT information group (BG-30); exactly one is allowed. Please give exactly one VAT information group (BG-30) per invoice line. Thank you for your support. Kind regards
Source and date
This explanation is based on the official rule text. The message the validator reports for your file always takes precedence. As of October 2026.