GR-R-001-6: When Supplier is Greek, the Invoice Id fifth segment must…

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-001-6] When Supplier is Greek, the Invoice Id fifth segment must not be empty

Why this error occurs

The element or combination is not allowed in this context. The file contains something the standard forbids: an element that must not be repeated, a value that contradicts another field, or data that belongs to a different profile.

How to fix it

Remove the offending element or make the two fields consistent as described in the rule text. If your software adds the element automatically, check for a profile setting (e.g. "EN 16931" vs "EXTENDED") or an export option that suppresses it.

What the validator checks

Checked element (context):

UBL

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

Test (XPath):

string-length($IdSegments[5]) > 0

Check your invoice

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Check your invoice →

Same check via API:

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

Related rules

GR-R-001-1 When the Supplier is Greek, the Invoice Id should consist of 6 segments
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-001-7 When Supplier is Greek, the Invoice Id sixth segment must not be empty

Frequently asked questions

What does GR-R-001-6 mean?

GR-R-001-6 is a peppol national rule: When Supplier is Greek, the Invoice Id fifth segment must not be empty

Will my invoice be rejected because of GR-R-001-6?

Yes. GR-R-001-6 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-001-6 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-001-6: When Supplier is Greek, the Invoice Id fifth segment must not be empty