crm_mensaje/crm_lead_view.xml

<?xml version="1.0"?>
<openerp>
    <data>

        <!--
            OPPORTUNITY


        <record id="relate_partner_leads" model="ir.actions.act_window">
          <field name="name">Iniciativas</field>
          <field name="res_model">crm.lead</field>
          <field name="view_mode">tree,form</field>
          <field name="domain">[('type','=','lead')]</field>
          <field name="context">{
              'search_default_partner_id': active_id,
              'stage_type': 'lead',
              'default_type': 'lead'
          }</field>
          <field name="view_id" eval="False"/>
          <field name="search_view_id" ref="crm.view_crm_case_leads_filter"/>
          <field name="help" type="html">
            <p class="oe_view_nocontent_create">
              Click to create an lead related to this customer.
            </p><p>
              Use leads to keep track of your sales pipeline, follow
              up potential sales and better forecast your future revenues.
            </p><p>
              You will be able to plan meetings and phone calls from
              leads, convert them into quotations, attach related
              documents, track all discussions, and much more.
            </p>
          </field>
        </record>   -->

        <record id="crm_case_categ_mensaje2" model="ir.actions.act_window">
               <field name="name">Mensajes</field>
               <field name="res_model">crm.mensaje</field>
               <field name="view_type">form</field>
               <field name="view_mode">tree,form</field>
               <field name="context">{'default_opportunity_id': active_id}</field>
               <field name="help" type="html">
                 <p class="oe_view_nocontent_create">
                   Click para crear un mensaje recibido para una oportunidad de venta.
                 </p><p>
                   El registro de mensaje es importante ya que acompaña para el
                   seguimiento de iniciativas y oportunidades para la obtencion
                   de ventas.
                 </p>
               </field>
           </record>


        <!-- Opportunities Form View ,'search_default_partner_id': active_id, 'default_partner_id': active_id-->
        <record model="ir.ui.view" id="crm_case_form_view_oppor3">
            <field name="name">Mensajes</field>
            <field name="model">crm.lead</field>
            <field name="inherit_id" ref="crm.crm_case_form_view_oppor"/>
            <field name="priority">20</field>
            <field name="arch" type="xml">

                        <div class="oe_right oe_button_box">
                            <button class="oe_inline oe_stat_button" type="action"
                                name="%(crm_case_categ_mensaje2)d"
                                context="{'default_opportunity_id': active_id, 'search_default_opportunity_id': active_id}"
                                icon="fa-pencil-square-o">
                                <field string="Mensaje" name="messenger_count" widget="statinfo"/>
                            </button>
                        </div>

            </field>
        </record>


    </data>
</openerp>