Only discounts are allowed for the price, hence the only valid value is false (meaning an allowance)

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Boolean
Fixed value
false
Business terms
tir01-p004
Rules
Identifier/Error message Flag
EHF-P09-CHA-B24901
Element 'cbc:ChargeIndicator' MUST contain value 'false'.
fatal
EHF-P09-CHA-B24902
Document MUST NOT contain elements not part of the data model.
fatal