Hi,

You can override a function using the super function.

Suppose if a button is calling a function named 'xyz' in the model 'sale.order', you can override the function 'xyz' like this,

class SaleOrder(models.Model):
    _inherit = 'sale.order'
    
    def xyz(self):
        res = super(SaleOrder, self).xyz()
        # do the necessary operations here
        return res

Thanks