3557761 - Hungary invoice failed with NAV errors

I'm sending an Hungarian invoice to my buyer and it is failing validations and throwing multiple errors like:

• INV-662: You must provide your NAV registration information in your Ariba Network Company Profile to enable Ariba Network to report your invoices to the NAV.
• INV-555: You cannot create a tax invoice through SAP Business Network because you have not yet created a legal profile. Create and activate a legal profile first to ensure that the required invoice data is reported to the NAV (Company profile >> Additional Address >> Setup Legal Profile). However, if you want your invoices to be considered proforma, disable tax invoicing in your Company Profile >> Electronic Invoice Routing >> Tax Invoicing and Archiving.

SAP Business Network

Tax; Invoice; Hungary; NAV; Rejected; Failed; Error;  , KBA , SBN-AN-TX-INV , Transaction (Invoicing) , How To