The unit price, exclusive of VAT, before subtracting Item price discount, can not be negative

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Amount
udt:AmountType
Example value
123.45
Business terms
BT-148
Attributes
Use Name Description
M @currencyID

Mandatory attribute. Use BT-5

Example value: SEK

Rules
Identifier/Error message Flag
BR-28
[BR-28]-The Item gross price (BT-148) shall NOT be negative.
fatal
BR-CL-03
[BR-CL-03]-currencyID MUST be coded using ISO code list 4217 alpha-3
fatal