i read about hidding the create, and the create and Edit options at the many2one fields and i try this solution by creating a custom addon and tested adding other fields at sales:
<record id="view_crm_lead_form" model="ir.ui.view">
<field name="name">view.crm.lead.form</field>
<field name="model">crm.lead</field>
<field name="inherit_id" ref="crm.crm_lead_view_form"/>
<field name="arch" type="xml">
<xpath expr="//field[@name='partner_id']" position="replace">
<field name="partner_id" options="{'no_quick_create':True}" string="Customer" context="{'res_partner_search_mode': type == 'opportunity' and 'customer' or False, 'default_name': contact_name or partner_name,.... etc />
</xpath>
</field>
</record>
just take the original field and add the option 'no_quick_create' and replace it, where is my mistake?
