[BR-53-GST-SG]-If the GST accounting currency code (BT-6-GST) is present, then the Invoice total GST amount (BT-111-GST), Invoice total including GST amount and Invoice Total excluding GST amount in accounting currency shall be provided.
BR-53-GST-SG
/ubl:Invoice | /cn:CreditNote
every $taxcurrency in cbc:TaxCurrencyCode satisfies exists(//cac:TaxTotal/cbc:TaxAmount[@currencyID=$taxcurrency]) and exists(cac:AdditionalDocumentReference[cbc:DocumentTypeCode='sgdtotal-incl-gst']) and exists(cac:AdditionalDocumentReference[cbc:DocumentTypeCode='sgdtotal-excl-gst'])