BR-KSA-EN16931-09
Only one tax total (BG-22) without tax subtotals (BG-23) must be provided when tax currency code is provided .
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
cbc:TaxCurrencyCode
count(../cac:TaxTotal[not(cac:TaxSubtotal)]) = 1
Checked with Saudi Arabia ZATCA Tax Invoice (UBL), Saudi Arabia ZATCA Simplified Tax Invoice (UBL)