GR-R-001-1: When the Supplier is Greek, the Invoice Id should consist…

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-001-1] When the Supplier is Greek, the Invoice Id should consist of 6 segments

Why this error occurs

This rule only applies when another field has a certain value (for example a payment means code or an invoice type). Your file triggers the condition but does not provide the data that then becomes mandatory, or provides data that is then forbidden.

How to fix it

Either change the triggering value so the condition no longer applies, or add/remove the dependent elements as the rule text describes. Check the condition in the XPath test above to see exactly which value triggers it.

What the validator checks

Checked element (context):

UBL

/ubl-invoice:Invoice/cbc:ID[$isGreekSender] | /ubl-creditnote:CreditNote/cbc:ID[$isGreekSender]

Test (XPath):

count($IdSegments) = 6

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-001-2 When the Supplier is Greek, the Invoice Id first segment must be a valid TIN Number…
GR-R-001-3 When the Supplier is Greek, the Invoice Id second segment must be a valid Date that…
GR-R-001-4 When Supplier is Greek, the Invoice Id third segment must be a positive integer
GR-R-001-5 When Supplier is Greek, the Invoice Id in the fourth segment must be a valid greek…
GR-R-001-6 When Supplier is Greek, the Invoice Id fifth segment must not be empty
GR-R-001-7 When Supplier is Greek, the Invoice Id sixth segment must not be empty

Frequently asked questions

What does GR-R-001-1 mean?

GR-R-001-1 is a peppol national rule: When the Supplier is Greek, the Invoice Id should consist of 6 segments

Will my invoice be rejected because of GR-R-001-1?

Yes. GR-R-001-1 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-001-1 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-001-1: When the Supplier is Greek, the Invoice Id should consist of 6 segments