I added a field in move_lines(stock.picking) using xpath expression.

python

class StockMove(models.Model):

    _inherit = "stock.move"

   serial_no = fields.Char(string="Serial#")

This my field to add in one2many. In my xml I added like this.

xml

<record model="ir.ui.view" id="view_picking_form_inherit_serial_no">

            <field name="name">stock.picking.serial.form</field>

            <field name="model">stock.picking</field>

            <field name="inherit_id" ref="stock.view_picking_form"/>

            <field name="arch" type="xml">

                    <xpath expr="//notebook/page/field[@name='move_lines']/tree/field[@name='product_id']" position="after">

                              <field name="serial_no"/>

                </xpath>    

            </field>

  </record>

Notes

I get a validation error the xpath expression cannot be located in the parent view.How to solve this issue?