Hello Antoine,
As you said this is related to lp:820801 , for the solution of lp:820801 is solved your comment#3 's problem.
We have provided a "Compute Taxes" button also after the pro-forma, so for this type of problem just again compute the invoice after pro-forma,
I have attached a video for your more information,So would you please check it and notify me have you still faced the problem or not.
Correct me If I am wrong!
Thanks and waiting for your reply!
Hello Antoine,
As you said this is related to lp:820801 , for the solution of lp:820801 is solved your comment#3 's problem.
We have provided a "Compute Taxes" button also after the pro-forma, so for this type of problem just again compute the invoice after pro-forma,
I have attached a video for your more information,So would you please check it and notify me have you still faced the problem or not.
Correct me If I am wrong!
Thanks and waiting for your reply!