UBL-SR-38-GST-SG
Invoiced item GST exemption reason text shall occur maximum once
warning: reported, still valid
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:InvoiceLine | cac:CreditNoteLine
Test
(count(cac:Item/cac:ClassifiedTaxCategory/cbc:TaxExemptionReason) <= 1)
Checked with PINT SG Invoice, PINT SG Credit Note