I have installed Odoo 11, and I have a product called "Fire bottle". This product is manufactured. During the sale in the description column Text is added since this product will be customized for the buyer eg " I love him".

I have written the view.xml as below

<record model="ir.ui.view" id="view_form_manufacture_extend">
  <field name="name">Description</field>
  <field name="model">mrp.production</field>
  <field name="inherit_id" ref="mrp.mrp_production_form_view"/>
  <field name="arch" type="xml">
    <xpath expr="//field[@name='production_location_id']" position="after">
     <field name="Description"></field> 
    </xpath>
  </field>
</record>

and the models.py as shown.

class odoo_customization(models.Model):
    _inherit = 'mrp.production'
   sale_order_desc=fields.Many2one('sale.order.line', 'Sale_desc')
   Description=fields.Char(String='Description', related='sale_order_desc.name')
    

PS: I suspect it is py code. 

Thanks in advance