Specification identifier (ibt-024) MUST start with the 'urn:peppol:pint:billing-1@eu-1'.
ALIGNED-IBRP-004-EU
ubl-creditnote:CreditNote | ubl-invoice:Invoice
starts-with(normalize-space(cbc:CustomizationID/text()), 'urn:peppol:pint:billing-1@eu-1')