How to transfer a value from order to invoice

Question

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 !

ayman mohammed adam · Answer

Dear Matthieu,
if i understand you correctly , when you want to send value directly to total that is impossible because the total field in invoice is functional field , it's function return the total after sum all the subtotal on the invoice lines. if you want to send value to invoice you can do by any of two ways:
1- send it in invoice lines.
2. create new field on account.invoice and send the value directly,. in this case you must modify the total functional field.

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