I'd like to record my repair order (repair app) to a specific journal when I process the invoice. 

So I created a specific journal link to the specific chart of account 

when I create a new order from repair app, once the invoice is generated, it is by default linked to the sale journal, so I have to Edit the invoice and then link it to the repair journal

That works but  it is source of error, as we need every time to modifiy the journal for each invoice before validating it. 

I feel like they must be a way with automated action to do it, anyone could advise / hlep  me on how I could handle it ? 

thanks,