Hi YUN ZHU
Thank you very much for the answer!
I add the following for documentation, I created a Microsoft Ticket for my case.
Maybe somebody can relate.
We are currently using the feature and it works if you have a QR-Reader. The QR-Bill part is available.
But in some cases we receive QR-Invoices in which the amount is left empty, it has to be filled out by the accountant of the company that receives the Bill, pretty common in Switzerland. Every thing else is filled out like the reference no. , the payment information etc.
See below example:

The main problem now is that we can not change the value in this field after we "read" the QR-Bill, it's non editable. And since there is no amount the invoice can't be posted.
Currently as a "workaround" for such invoices we add them manually, which is not the best solution.