Reox

I have to submit all invoices (no proforma) to the government and I do not like to submit 1000 invoices with the value 0€ I need ideas on how to solve this problem.

I forgot to say that i have enabled the proforma numbering system so that invoices paid entering another line of billing, so it's a problem.

Greetings. I have doubts about what is the best way to make a promotion and I need help. An example: I have a promotion of a service in which the first month is free for this generated a code that he discounted the total amount of that month (-4.5 €), the problem is that when customers enter the code then the system automatically sends them a invoice of €0 with the status "PAID", this is a problem for me. any ideas? Thanks in advance.