Message

Element 'cbc:ChargeIndicator' MUST contain value 'false'.

Context
/ubl:Order/cac:OrderLine/cac:LineItem/cac:Price/cac:AllowanceCharge/cbc:ChargeIndicator
Test
normalize-space(text()) = 'false'
Usage
/ ubl:Order / cac:OrderLine / cac:LineItem / cac:Price / cac:AllowanceCharge / cbc:ChargeIndicator