Message

The Item gross price SHALL NOT be negative.

Context
cac:Price
Test
(cac:AllowanceCharge/cbc:BaseAmount) >= 0 or not(exists(cac:AllowanceCharge/cbc:BaseAmount))
Usage
/ ubl:Order / cac:OrderLine / cac:LineItem / cac:Price / cac:AllowanceCharge / cbc:BaseAmount