help please Avoid creating invoice by payment module

[xbart]

Hi, I need your advice.

I have a shop, where are 2 payment options...

Online payment - here I want to prestashop creates invoice, there is almost everything okay.

Pay by cash in local store - and there is the problem, I need to avoid prestashop to create invoice for orders with this payment type. 

I see, when I mark order as finished, there is invoice crated, even if I made change in settings of orders to do not create invoice PDF, at any of theese order status steps.

 

I just need to avoid generating invoice, for local payment module, becasuse of there is not incerasing numbers in invoices.. eg.. 1, 3 ,4, 5, 6, 6, 10... 
I need to have invoices only for online payment plugin, what is working, but I need to disable invoicing for local payment module..

 

PLease help !

Thanks for every advice.