partner-contact/partner_relations/view/res_partner_relation.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>

        <record id="form_res_partner_relation" model="ir.ui.view">
            <field name="model">res.partner.relation</field>
            <field type="xml" name="arch">
                <form string="Partner Relation">
                    <sheet>
                        <field name="left_partner_id" />
                        <field name="type_id" />
                        <field name="right_partner_id" />
                    </sheet>
                </form>
            </field>
        </record>

        <record id="tree_res_partner_relation" model="ir.ui.view">
            <field name="model">res.partner.relation</field>
            <field name="arch" type="xml">
                <tree
                    string="Partner Relations"
                    colors="gray:date_end and date_end &lt; current_date or not active;blue:date_start &gt; current_date"
                    editable="bottom"
                >
                    <field
                        name="left_partner_id"
                        attrs="{
                            'readonly': [('type_selection_id','=',False)],
                        }"
                        options="{'create': false, 'create_edit': false}"
                    />
                    <field
                        name="type_selection_id"
                        requiread="True"
                        context="{
                            'parent_model': 'res.partner',
                            'parent_id': parent.id,
                        }"
                        domain="[
                            '|',
                            ('contact_type_this', '=', parent.is_company and 'c' or 'p'),
                            ('contact_type_this', '=', False),
                            ('search_partner_category_this', '=', parent.category_id),
                        ]"
                        options="{'create': false, 'create_edit': false}"
                        on_change="on_change_type_selection_id(type_selection_id)"
                    />
                    <field
                        name="right_partner_id"
                        attrs="{
                            'readonly': [('type_selection_id','=',False)],
                        }"
                        options="{'create': false, 'create_edit': false}"
                    />
                    <field name="date_start" />
                    <field name="date_end" />
                    <field name="active" />
                </tree>
            </field>
        </record>

        <record id="action_show_right_relation_partners" model="ir.actions.server">
            <field name="sequence" eval="5"/>
            <field name="state">code</field>
            <field name="type">ir.actions.server</field>
            <field name="model_id" ref="model_res_partner_relation"/>
            <field name="code">action = self.get_action_related_partners(cr, uid, context.get('active_ids', []), dict(context or {}, partner_relations_show_side='right'))</field>
            <field name="condition">True</field>
            <field name="name">Show partners</field>
        </record>

        <record id="action_show_right_relation_partners_value" model="ir.values">
            <field name="name">Show partners</field>
            <field name="key">action</field>
            <field name="key2">client_action_multi</field>
            <field name="model">res.partner.relation.all</field>
            <field name="value" eval="'ir.actions.server,%d' % ref('partner_relations.action_show_right_relation_partners')" />
        </record>

    </data>
</openerp>