A german banking app already tried to do something similar [0], but used the QR code to encode an URL containing all data instead. It seems a bit more efficient.

But FWIW, it never got popular. I guess you can tell by the design of the website.

[0] http://www.bezahlcode.de (In German only)

Edit: It is actually not encoding all data of the invoice, but only the bank details needed for the transfer.