Message

[BR-CO-18-GST-SG]-An Invoice shall at least have one GST Breakdown group (BG-23-GST).

Context
/ubl:Invoice | /cn:CreditNote
Test
exists(cac:TaxTotal/cac:TaxSubtotal)
Usage
/ ubl:Invoice / cac:TaxTotal / cac:TaxSubtotal
/ ubl:CreditNote / cac:TaxTotal / cac:TaxSubtotal