Hello,
in pos_order, I inherited "action_invoice" to send a value I created for a reduction ticket (here is the code : http://pastebin.com/JxjXgD5y).
The action is done when you click on the button in the red circle here : http://i.imgur.com/o1bT6Ev.png
The problem I have is that I don't know how and where I can get this value in account_invoice.
Thank you in advance for your help !