What is the difference between concept and final invoices?

Originally written in English, any translations errors should be checked against the original atricle

In the system we start all invoices in a concept state. With each booking we also create a concept invoice automatically. The idea behind an invoice is because of the way campsites work.

As for the hotel business as for campsite business it is very normal to have a single invoice of the entire stay at the moment you are leaving. Escpecially for hotels it is really common to add all kinds of things to the invoice such as usage in the hotel bar, restaurant or mini bar. 

At the end of the stay the invoice has to be fully paid.  

By using a concept invoice, without an invoice number and invoice date we create a open balance for the customer (or pro forma invoice) we can create all kind of changes to the concept invoice.

Products can be added, we can change the length of stay etc etc.

At a certain point the invoice will change from concept to final. The default setting of the system is on checkout. The invoice will then get an invoice number and invoice date and the invoice can not be changed anymore.

It is also possible to manually handle the change from concept to final in stead of doing this automatically on checkout