Hi,

The issue arose because the "referred" field appears in two different locations in the view:

• For leads: Under the Marketing group on the "Extra Info" page.
  
• For opportunities: Under the Marketing group on the "Extra Information" page.
  

To fix this, ensure your model inheritance is correct:

Python:

class CRMLead(models.Model):

_inherit = 'crm.lead'

x_ref_by = fields.Many2one('res.users', string='Referred By', default=lambda self: self.env.user)

XML:

<odoo>

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

<field name="name">crm.lead.form.inherit.referred</field>

<field name="model">crm.lead</field>

<field name="inherit_id" ref="crm.crm_lead_view_form"/>

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

<!-- Replace the "referred" field in the Extra Info page (for leads) -->

<xpath expr="//page[@name='extra']//field[@name='referred']" position="replace">

<field name="x_ref_by"/>

</xpath>

<!-- Replace the "referred" field in the Extra Information page (for opportunities) -->

<xpath expr="//page[@name='lead']//field[@name='referred']" position="replace">

<field name="x_ref_by"/>

</xpath>

</field>

</record>

</odoo>

Hope it helps