Possibility of changing invoice after the post!!!

Hello all!! I have a client, that wants following functionality: - possibility of changing invoice in 7 days after the release and print of this invoice. I know that we can make a credit memos, but that means more documentation papers and more time. The main priority for him is time and flexibility of selling products. I heard about companies that offer add-ons, maybe they also have solution of this problem. I need your help!!! Best regards!

Is that legal?

See also http://www.mibuso.com/forum/viewtopic.php?t=8394&highlight=

Definitely NOT legal in Poland. What are you actually trying to achive.

Hello, Here, we print the invoice BEFORE posting it. So, all our invoices are always “not posted”. And every x days, we post the lots of invoices So, we can always change it (after the print en before the posting)