eiru_reports_baco/views/menus.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
  <data>
    <!-- main menu name -->
    <menuitem id="baco_parent_menu" name="BACO" parent="eiru_reports.eiru_reports_main_menu" sequence="10"/>

    <!-- sub menu -->

    <menuitem id="product_ranking_baco_menu" parent="baco_parent_menu" name="Ranking de productos por categoría" action="product_ranking_baco_action" sequence="1"/>

  </data>
</openerp>