GR-R-004-2
When Supplier is Greek, the MARK Number must be a positive integer
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 ( /*/cac:AccountingSupplierParty/cac:Party/cac:PostalAddress/cac:Country/cbc:IdentificationCode = 'GR') and cbc:DocumentDescription = '##M.AR.K##']/cbc:ID
Test
matches(.,'^[1-9]([0-9]*)')
Checked with Peppol BIS Billing 3.0 Invoice, Peppol BIS Billing 3.0 Credit Note