Display a warning popup in @api.constraint methode
I'm using Odoo 11 and I want to display a Warning popup in a @api.constraint method. The warning popup that i want to display have two button, the first is an OK button used to ignore the warning and the other one is an Cancel button used attempt the saving operation, it' s similar to the warning popup that odoo use like on the picture below :
<hna tu put the pic using drag/drop>
I searched a lot on the web and I found different proposed solutions like using Wizard, exception.Warning() and osv.except_osv(), but unfortunately no one of this solution gives me exactly what i want.
Any help please ?