Thank you all for your answers and sorry for my late reply.

I understand that I can make the invoices with a word processor but I would prefer to have the PDF generated automatically. I am a software developer and I am ready to make the changes required myself.

What I would like is to generate a PDF for the Supplier Invoice. How can I achieve that?

I'm not saying it can't done, but there would have to be changes to the database structure. And while most of the code required probably already exists, there's the matter of fitting this thing into the current workflow and menus. We can probably expect users to distinguish between customer and supplier invoices, but here's something which could be confused with both. Should it be enabled by default? If not, should the setting be per company, user or supplier? There's a lot that need to be thought through if we want such a feature.

Anyway, this kind of invoicing isn't an accounting issue at all, but rather an administrative shortcut. While you do need an invoice to match the payment, the accountant (or accounting system) doesn't really care who issued it.

For now, I suggest you create an invoice in your favourite word processor and let FA handle it as any supplier invoice.

@joe: Print Supplier Invoices is now needed for this use case. This way we can keep track of how they have been entered in FA.

The problem is that I need to print and send this "self-billing" invoice to them. I didn't find a way to do that.

Do you know how to do that?

According to EU directives a company can generate invoices itself for its supplier in certain conditions. (link for Ireland).

Is there a way to generate Self-billing invoices in Front Accounting?

Kind Regards,
Olivier.