/ubl:Invoice/cac:TaxTotal[cbc:TaxAmount/@currencyID = ../cbc:TaxCurrencyCode]/cbc:TaxAmount/@currencyID

VRBL-Invoice-NZ-1p0 - Accounting Tax Amount Currency Code

New Zealand | VRBL-Invoice-NZ-1p0

Context ID	INV1066
Usage	M

Description

Syntax required attribute, value must equal invoice Tax currency code