When you issue a sales invoice, if the buyer is registered for e-Invoice, the document reaches their e-Invoice account directly. If the buyer is not registered, the same invoice is issued as an e-Archive document and reported to the tax authority, and you do not need to print a paper invoice.
The business does not need to track this separately. TEON keeps the buyer’s registration status on their contact card and refreshes it once a day; when an invoice is issued, it decides on its own which type to send. You just issue the invoice as normal.
The practical difference is this: an e-Invoice lands directly in the other side’s e-Invoice system. An e-Archive document is one issued to a buyer who is not registered; its status is reported to the tax authority, but getting the document itself to the buyer, by email or otherwise, is up to the business.