Abillio invoices are registered in the accounting only when the recipient of the invoice (customer) has selected the option “confirm” when opening the invoice in the e-mail - until then the invoice is equated to a “sample”.
Here's what it looks like:
You can get acquainted with the Abillio invoice format and approval process:
(a) adding yourself as a 'customer' and sending a trial invoice to your email;
(b) by creating a trial invoice and sending it to your customer, informing you in advance that the trial invoice needs to be 'rejected' after reading it.