Rules/EN 16931/Error
BR-06
Peppol BIS Billing 3.0.21An Invoice shall contain the Seller name (BT-27).
In plain English
The seller's name (BT-27) is missing.
How to fix it
Set the seller's registered name in cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName.
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