Hi,

You may try like this:

class SaleOrder(models.Model):
     _inherit = "sale.order"
     
     @api.model
     def create(self, vals):
         res = super(SaleOrder, self).create(vals)
         total = res.amount_total            //compute field value
         return res

I wonder who marked this answer as resolved, when it is apparently, the solution isn't nowhere what am looking for.

dear deep,

you need to do something like this,

 @api.multi
 @api.depends('amount_currency','currency_id')
 def _amount_in_words(self):
        """
        this Function uses to get the ratification amount in words.
        """
     for rec in self:
         self.amount_words_letters = amount_to_text((self.amount_currency or 0.00))
amount_text= fields.Char(compute='_amount_in_words', string='Amount In Words', store=True)

I hope I helped you.