Message

[BR-110-GST-SG]-The GST accounting currency code (BT-6-GST) must be present when Invoice total including GST amount or Invoice Total excluding GST amount in accounting currency are provided.

Context
/ubl:Invoice | /cn:CreditNote
Test
exists(cbc:TaxCurrencyCode) or not(exists(cac:AdditionalDocumentReference[cbc:DocumentTypeCode='sgdtotal-incl-gst']) or exists(cac:AdditionalDocumentReference[cbc:DocumentTypeCode='sgdtotal-excl-gst']))
Usage
/ ubl:Invoice / cbc:TaxCurrencyCode
/ ubl:CreditNote / cbc:TaxCurrencyCode