Hi,

Try the following:

in .py file:

class stock_picking(osv.osv):
    _inherit="stock.picking"     
     
    _columns ={
           'x_order_description': fields.related('sale_id', 'client_order_ref', string='Order Description', type='char', size=64, required=True, readonly=True)
           
           }

in your xml file:

<record id="view_picking_form_form_inherited" model="ir.ui.view">
            <field name="name">view.picking.form.view.inherited</field>
            <field name="model">stock.picking</field>
            <field name="inherit_id" ref="stock.view_picking_form"/>
            <field name="arch" type="xml">
                <field name="partner_id" position="after">
                	<field name="x_order_description" />
                </field>
            </field>
        </record>

Hope this helps