path: root/jasper_reports/views/jasper_report_menu.xml

<?xml version="1.0"?>
<odoo>
    <menuitem id="jasper_reports_menu"
        name="Jasper Reports"
        parent="base.menu_custom" />
    <menuitem id="jasper_create_data_template_menu"
        parent="jasper_reports_menu"
        action="action_jasper_create_date_template"
        sequence="1"/>
</odoo>