For both BuyerTradeParty and ShipToTradeParty, Fakturama is exporting the last name of the Company "owner". This translates to:

This would only be correct for end customers and self-employed people. For companies, the exported name is either wrong (an anonymous company has no well-defined owner) or missing (empty string) (assuming firstname and lastname are intentionally left to empty values).

Fakturama
Version: 2.2.0-SNAPSHOT
Build-ID: 20250330-1224
Java Version: 17.0.1
Windows 11 French with "." as decimal separator. MariaDB 11.8 and HSQLDB were tested as the database backend, alternatively.