[UBL-DT-12]-Format attribute should not be present
Stored validation assertion
not(//@format)
UBL-DT-12 is a warning rule in the schema layer of Peppol BIS Billing 3.0.20 · UBL. An invoice that breaks it is flagged but not rejected.
What this rule requires
This rule forbids the attribute //@format in a UBL document. The test is not(//@format), evaluated for /ubl:Invoice, /cn:CreditNote, so the rule reports every place where that attribute is present.
How to fix
Remove //@format from the document. If your system always writes it, change the export so that it leaves this attribute out.
Guidance on this rule. The original text above is authoritative.
Where to go next
No published Peppol BIS Billing UBL release comparison lists a change to UBL-DT-12.