GR-R-008-3: When Supplier is Greek and the INVOICE URL Document…

StandardPeppol BIS Billing 3.0 country rules (NL, DE, IT, SE, DK, NO, GR, IS)CountryGreeceSeverityError: the invoice is rejectedSyntaxUBLApplies toOnly when the seller (or for some rules the buyer) is in the named country: the rule is triggered by the country code of the party. Dutch rules implement NLCIUS, German rules the XRechnung requirements inside Peppol.

Official rule text

[GR-R-008-3] When Supplier is Greek and the INVOICE URL Document reference exists, the External Reference URI should be present

Why this error occurs

The value is present but does not match the required pattern: wrong date format, an IBAN with a wrong check digit, an e-mail address without a valid structure, a URL without scheme, or a text with forbidden characters.

How to fix it

Correct the value so it matches the format named in the rule: dates as YYYY-MM-DD in UBL and YYYYMMDD with format="102" in CII, IBANs without spaces and with a valid checksum, e-mail addresses with exactly one @, URLs starting with http:// or https://.

What the validator checks

Checked element (context):

UBL

cac:AdditionalDocumentReference[$isGreekSender and cbc:DocumentDescription = '##INVOICE|URL##']

Test (XPath):

string-length(normalize-space(cac:Attachment/cac:ExternalReference/cbc:URI))>0

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.

Check your invoice →

Same check via API:

curl -F file=@invoice.xml https://einvoicechecker.com/v1/validate

Related rules

GR-R-008-2 When Supplier is Greek, there should be no more than one invoice url

Frequently asked questions

What does GR-R-008-3 mean?

GR-R-008-3 is a peppol national rule: When Supplier is Greek and the INVOICE URL Document reference exists, the External Reference URI should be present

Will my invoice be rejected because of GR-R-008-3?

Yes. GR-R-008-3 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals, KSeF) reject the invoice until it is fixed.

Which formats does GR-R-008-3 apply to?

Only when the seller (or for some rules the buyer) is in the named country: the rule is triggered by the country code of the party. Dutch rules implement NLCIUS, German rules the XRechnung requirements inside Peppol. Syntax: UBL.

Source: Peppol BIS Billing 3.0.20 national rules (November 2025). Catalogue generated from the official rule sets on 2026-10-15.

GR-R-008-3: When Supplier is Greek and the INVOICE URL Document reference exists, the External…