Hi,
I have faced this issue In my case,I have proposed ( ABAPer) to get the automatic print from Invoice it means ,the movement we save the invoice in VF01 then system will automatically show us a pop up box with printer to get the printout of invoice.In my case,I donno ,what he has done to get this but we got problem that the movement we save the billing ,billing number is generating by system and if I execute same number in VF02 then system is saying that document doesn't exist.So,finally ,he has fixed this issue.So,please talk with ABAPer on this issue.
Thanks,
Naren