When the credit note is a VAT credit note it must state the sellers VAT registration number and tax scheme. The supplier's VAT-number (Norwegian MVA number) made out of the organisational number and the letters MVA. Mandatory if the supplier is taxable.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
987654321MVA
Rules
Identifier/Error message Flag
EUGEN-T14-R041
The VAT identifier for the supplier SHOULD be prefixed with country code.
warning
NOGOV-T14-R003
If the VAT total amount in a credit note exists it MUST contain the suppliers VAT number.
fatal