partner-contact/partner_multi_relation/views/menu.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <menuitem
        id="menu_res_partner_relation"
        name="Relations"
        sequence="3"
        parent="contacts.menu_contacts"
    />
    <menuitem
        id="menu_res_partner_relation_all"
        sequence="3"
        parent="menu_res_partner_relation"
        action="action_res_partner_relation_all"
    />
    <act_window
        id="action_res_partner_relation_type"
        res_model="res.partner.relation.type"
        view_mode="tree,form"
        name="Partner Relations Types"
    />
    <menuitem
        id="menu_res_partner_relation_type"
        name="Relation Types"
        parent="menu_res_partner_relation"
        action="action_res_partner_relation_type"
    />
</odoo>