Official rule text
[BR-DEX-05] Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD list.
Why this error occurs
The value must come from a fixed code list and the value in your file is not on it. Common causes: a free-text value instead of a code ("Invoice" instead of 380), a code from an older list version, lower-case codes, or a code valid in another standard but not in this one.
How to fix it
Replace the value with a code from the list named in the rule text (UNTDID 1001 for document types, UNTDID 5305 for VAT categories, ISO 4217 for currencies, ISO 3166-1 for countries, UN/ECE Recommendation 20/21 for units, EAS for electronic addresses, ISO 6523 ICD for scheme identifiers). Codes are case-sensitive.
What the validator checks
Checked element (context):
UBL
cac:PartyLegalEntity/cbc:CompanyID[@schemeID and $isExtension]Test (XPath):
((not(contains(normalize-space(@schemeID), ' ')) and contains($ISO-6523-ICD-EXT-CODES, concat(' ', normalize-space(@schemeID), ' '))))CII
ram:ID[@schemeID and $isExtension][not(ancestor::ram:SpecifiedTaxRegistration)]Test (XPath):
((not(contains(normalize-space(@schemeID), ' ')) and contains($ISO-6523-ICD-EXT-CODES, concat(' ', normalize-space(@schemeID), ' '))))Check your invoice
Drop your XML or PDF on the validator and every failed rule is linked to its page here. Free, no account, the file is not stored.
Same check via API:
curl -F file=@invoice.xml https://einvoicechecker.com/v1/validateRelated rules
BR-DEX-01The element … "Attached Document" uses a MIME code that is not permittedBR-DEX-02The value of "Invoice line net amount" of an "INVOICE LINE" or a "SUB INVOICE LINE"…BR-DEX-03A Sub Invoice Line must contain exactly one "SUB INVOICE LINE VAT INFORMATION"BR-DEX-04Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD listBR-DEX-06Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD listBR-DEX-07Any scheme identifier for an Endpoint Identifier in … MUST belong to the CEF EAS code…BR-DEX-08Any scheme identifier for a Delivery location identifier in … MUST be coded using one…BR-DEX-09Amount due for payment = Invoice total amount with VAT - Paid amount + Rounding amount…
Frequently asked questions
What does BR-DEX-05 mean?
BR-DEX-05 is a xrechnung rule: Any scheme identifier in … MUST be coded using one of the ISO 6523 ICD list.
Will my invoice be rejected because of BR-DEX-05?
Yes. BR-DEX-05 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals) reject the invoice until it is fixed.
Which formats does BR-DEX-05 apply to?
XRechnung in UBL or CII syntax, including ZUGFeRD / Factur-X PDFs with the XRECHNUNG profile. Invoices to German public authorities (federal, state and municipal) must pass it. Syntax: UBL and CII.
Source: XRechnung 3.0.2, schematron 2.6.0 (KoSIT, September 2026). Catalogue generated from the official schematron on 2026-10-14.