server-tools/partner_do_merge/view/res_partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        
        <record model="ir.ui.view" id="view_partner_form_inh_partner_merge_form">
            <field name="name">view.partner.form.inh.partner.merge.form</field>
            <field name="type">form</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <xpath expr="//page[@name='page_history']" position="after">
                    <page string="Merged With" name="merged_with">
                        <field name='partner_merged_ids'/>
                    </page>
                </xpath>

            </field>
        </record>
    
    </data>
</openerp>