Hello Every one...

In Odoo 8 , Expense I have a field Budget whose value is coming from onchange, now what I want is when amount i.e total expense exceeds budget amount it should throw popup and that entry should not be saved.

There is no create or write function in hr_expense_expense(osv.osv) in odoo 8. But only function I think that can do needfull is as below , but how to call that before save button click.

def _amount(self, cr, uid, ids, field_name, arg, context=None):
        res= {}
        for expense in self.browse(cr, uid, ids, context=context):
            total = 0.0
            for line in expense.line_ids:
                total += line.unit_amount * line.unit_quantity
            res[expense.id] = total
        return res