Hi,

The reason, your redefined function, is not working because you do the post super method, if we want to perform our function first we need to do pre super function, ie,

class StockPicking(models.Model):
    _inherit = 'stock.picking'


    def button_validate(self):
        res = super(StockPicking, self).button_validate()
        for line in self:

            #You need to define your code here#

return res

Hope it helps

Hi,
There is are multiple button_validate button in the picking form view, you may be changing the action related to the invisible button with same method.

Ensure, that you have updated the method for both the buttons. You can use positional argument to location the second button:

button[@name='button_validate'][2]

Thanks