GR-R-008-3
When Supplier is Greek and the INVOICE URL Document reference exists, the External Reference URI should be present
error: the document is invalid
Peppol documentation ↗
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
Context
cac:AdditionalDocumentReference[$isGreekSender and cbc:DocumentDescription = '##INVOICE|URL##']
Test
string-length(normalize-space(cac:Attachment/cac:ExternalReference/cbc:URI))>0
Checked with Peppol BIS Billing 3.0 Invoice, Peppol BIS Billing 3.0 Credit Note