I'm creating a new record in "stock.picking" model , in order field has "onchange logic".

If order selected then it will add order lines in 'stock.move' upto this working good.

My problem is when am saving a record in 'stock.picking' , getting error

           Following fields invalid: "Stock Moves"

My Code:

    @api.onchange('po_id')

    def onchange_po_id(self):

        print self.id

        if self.po_id:

            pur_line = self.env['purchase.order.line'].search(

                                     [('order_id', '=', self.po_id.id)])

            move_lines = []

            for line in pur_line:

                date_planned = datetime.today().strftime(

                                        DEFAULT_SERVER_DATETIME_FORMAT)

                move_line = {

                    'name': line.product_id.name,

                    'price_unit': line.price_unit,

                    'product_uom': line.product_uom.id,

                    'product_uom_qty': line.product_qty,

                    'product_qty': line.product_qty,

                    'date': date_planned,

                    'date_expected': date_planned,

                    'product_id': line.product_id.id,

                    'state': 'draft',

                    'origin': line.order_id.name,

                    'location_id': line.product_id.property_stock_production.id,

                    'location_dest_id': self.location_dest_id.id,

                }

           move_lines += [(0, 0, move_line)]

            self.move_lines = move_lines

please anyone help us to resolve this issue.