fatalPeppol BIS Billing 3.0profileUBL
When Supplier is Greek and the INVOICE URL Document reference exists, the External Reference URI should be present
An invoice URL document reference exists but carries no URI.
Add the external reference URI (BT-124) to that document reference, or remove the reference.
UBL — context cac:AdditionalDocumentReference[$isGreekSender and cbc:DocumentDescription = '##INVOICE|URL##']
string-length(normalize-space(cac:Attachment/cac:ExternalReference/cbc:URI))>0
Nothing is stored, and the whole invoice is checked, not just this rule. A PDF only works if it is Factur-X / ZUGFeRD — a PDF with the invoice XML inside it.