There's an issue around RMA's timing of writing sub_activities to your manifest. Sub Activities are created after the
app.manifest block is called. So when you think you're targeting all your children, you're actually not.
The only way I found around this was to create the
<activity /> nodes manually instead of using
application.add_child 'activity' inside your
app.manifest.child('application') block to write the nodes yourself.
If you want to see what they look like, checkout your