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

Invoice Tax Subtotal Amount Currency Code

Germany | VRBL-Invoice-DE-ZUGFeRD-2p3
Context ID INV1049
Usage M
Format ISO 4217 alpha-3
Example Value EUR

Description

Syntax required attribute, value must equal invoice document currency.