Ho All,

I am trying to add some extra fields to (stock.picking, stock_move, stock.move.line) models

Code is IS running good, but it does not save data to database

I cannot add photos 

code IS:

from odoo import models,fields, api
from odoo.addons import decimal_precision as dp
from num2words import num2words


class StockMove(models.Model):
    _inherit = "stock.move"

    br_currency_id = fields.Many2one(related='picking_id.currency_id',
                                     store=True,
                                     string='Currency',
                                     readonly=True)
    br_price_unit = fields.Float(string='U. Price',
                                 required=True,
                                 digits=dp.get_precision('Product Price'),
                                 store=True)
    br_price_total = fields.Float(string='Total', store=True)

"""
    @api.onchange('product_id','br_price_unit','quantity_done')
    def _compute_amount(self):
        self.br_price_unit = self.product_id.standard_price
        self.br_price_total=self.product_id.standard_price * self.quantity_done
"""


class StockMoveLines(models.Model):
    _inherit = "stock.move.line"

    br_currency_id = fields.Many2one(related='picking_id.currency_id',
                                     store=True, string='Currency', readonly=True)
    br_price_unit = fields.Float(string='U. Price',
                                 required=True,
                                 digits=dp.get_precision('Product Price'),
                                 store=True)
    br_price_total = fields.Float(string='Total', store=True)

    @api.onchange('product_id', 'br_price_unit', 'qty_done')
    def _compute_amount(self):
        self.br_price_unit = self.product_id.standard_price
        self.br_price_total = self.product_id.standard_price * self.qty_done


class StockPicking(models.Model):
    _inherit = "stock.picking"

    br_vendor_ref = fields.Char(string="Vendor Reference")
    currency_id = fields.Many2one('res.currency', 'Currency',
                                     readonly=True,
                                     default=lambda self: self.env.user.company_id.currency_id.id)
    br_amount_total = fields.Monetary(string='Total',
                                      store=True,
                                      readonly=True,
                                      compute='_amount_all')
    br_total_amount_in_words = fields.Char(string="Amount in Words",
                                        store=True,
                                        compute='_amount_all')

    """
    def _amount_all(self):
        for p in self:
            p.amount_total=0.0
            p.total_amount_in_words='a'
    """
    @api.depends('move_line_ids.br_price_total')
    def _amount_all(self):
        for picking in self:
            amount_total = 0.0
            for line in picking.move_line_ids:
                amount_total += line.br_price_total

            lang = picking.partner_id and picking.partner_id.lang[:2]
            try:
                test = num2words(42, lang=lang)
            except NotImplementedError:
                lang = 'en'
            numword = num2words(amount_total, lang=lang)

            picking.update({
                'br_amount_total': amount_total,
                'br_total_amount_in_words': numword,
            })