Enter your idea

I am having problems with Xero automatically changing my due by date when I adjust the invoice date. I found a previous post where someone had the same problem and it was marked as resolved. But that is not the case. We often draft invoices for a customer - with carefully calculated due dates based on the service to be performed. When I go back to issue and approve the invoice - the invoice date changes but I want the due date to stay the same. I have to recalculate now as Xero changes it. Can this be fixed - or at least made an option to have due dates not automatically change once set?
Thank you