Hi Paulo,

If the order doesn't strictly matter, then the following code is the easiest approach:

@api.multi
def invoice_print(self):
    res = super(ReportController, self).invoice_print()
    self.write({'print_button_pressed': True})
    return res

The main thing to note is that you are returning the result of the super, which contains the print action. As I mentioned, the order wrong in this, but in most case it shouldn't matter. This change will technically come into effect before the invoice is printed, which will only matter if you are showing that field on the invoice and need the value from before the change.

If you do need the original value, you can use the following at the end of the invoice report:

<t t-set="dummy" t-value="o.your_function_name()"/>

Then create a function your_function_name on the invoice with the code you need.