The currency in which the monetary amounts are stated must be stated in the invoice. Code from ISO4217.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Attributes
Use Name Description
M @listID

Identification of the codelist.

Example value: ISO4217

Rules
Identifier/Error message Flag
NOGOV-T10-R025
The attribute currencyID must have the same value as DocumentCurrencyCode, except the attribute for TransactionCurrencyTaxAmount.
fatal
CL-T10-R002
DocumentCurrencyCode MUST be coded using ISO code list 4217
fatal
BII2-T10-R005
An invoice MUST specify the currency code for the document
fatal
EHF-T10-B01101
Attribute 'listID' MUST be present.
warning