It works! Thank you. But now, its not showing my existing product but want me to create new one which I dont want. I want to select my existing product. If I need to create one, i will do it in product.product model as usual rule. Can you suggest me what I need to do?
here my code:
.py:
from odoo import models, fields, api
class CrmLead(models.Model):
_inherit = 'crm.lead'
product_ids = fields.One2many('product.product', 'crm_lead_id', string='Products')
class ProductProduct(models.Model):
_inherit = 'product.product'
crm_lead_id = fields.Many2one('crm.lead', string='CRM Lead')
product_image = fields.Binary(string='Product Image')

.xml:
<?xml version="1.0" encoding="utf-8"?>
<odoo>
<record id="wise_crm_lead_view_form_inherit" model="ir.ui.view">
<field name="name">techtrioz.crm.lead.form.inherit</field>
<field name="model">crm.lead</field>
<field name="inherit_id" ref="crm.crm_lead_view_form"/>
<field name="arch" type="xml">
<xpath expr="//page[@name='internal_notes']" position='after'>
<page string="Product Info" name="product_info">
<tree position="inside">
<field name="product_ids" widget="one2many_list">
<tree>
<field name="default_code"/>
<field name="product_image"/>
</tree>
</field>
</tree>
</page>
</xpath>
</field>
</record>
</odoo>

In that case it is better that you use a many2many relationship to be able to select already existing products, in the view you can still use the one2many widget even if the field is many2many