UBL-CR-670
A UBL invoice should not include a Price Allowance Reason
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.
/ubl:Invoice | /cn:CreditNote
not(//cac:Price/cac:AllowanceCharge/cbc:AllowanceChargeReason)
Checked with EN 16931 Invoice (UBL), EN 16931 Credit Note (UBL), Croatia eRačun Invoice (UBL), Croatia eRačun Credit Note (UBL)