XML : How to know odoo menu parent id?

I'm trying to make a module named travel_leave which inherits the "Leave Managements" module.

To create a new menuitem called "Travel leave request". It supposed to inherit and appear right after the "Leave request" menuitem under "Leaves" menu.

So how can I do it?

Here's my code in travel_leave_view.xml

  <menuitem name="Travel Request"                id="hr_holidays.menu_travel_request"                parent="hr_holidays.menu_open_ask_holidays"                sequence="11"/>    

By doing this it created a new menuitem under Leaves but yet it isn't listed among the other menuitems.

What is wrong in my code?