[BR-CO-14-GST-SG]-Invoice total GST amount (BT-110-GST) = Σ GST category tax amount (BT-117-GST).
BR-CO-14-GST-SG
/ubl:Invoice/cac:TaxTotal | /cn:CreditNote/cac:TaxTotal
(round(xs:decimal(child::cbc:TaxAmount) * 10 * 10) div 100 = round((sum(cac:TaxSubtotal/xs:decimal(cbc:TaxAmount)) * 10 * 10)) div 100) or not(cac:TaxSubtotal)