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

VRBL-Invoice-PL-B2B-3p0 - Accounting Tax Amount Currency Code

Poland | VRBL-Invoice-PL-B2B-3p0

Context ID	INV1066
Usage	M

Description

Syntax required attribute, value must equal invoice Tax currency code