I have a MVC portlet in Liferay 7.0 CE that defines a configuration key:

@Component(
    configurationPid = "com.foo.myportlet.ConfigID",
    immediate = true,
    property = {
        "com.liferay.portlet.display-category=My Portlets",
        ....
    },
    service = Portlet.class
)
public class MyPortlet extends MVCPortlet {
...
}

And the configuration class is define like this:
 

@Meta.OCD(id = "com.foo.myportlet.ConfigID")
public interface MyPortletConfig {

    @Meta.AD(
        deflt = "some default value",
        required = false
    )
    public String myProperty();
}

The porlet works fine, accessing the configuration property in my ActionCommand also works fine.

However, according to the documentation this should show up under "Control Panel -> System Settings -> Others" and I am pretty sure it did show up there at some time.

But the only entries in the "Others" section are "Apache Felix Declarative Service Implementation", "Apache Felix Event Admin Implementation" and "Apache Felix File Install"

I tried to re-create the search indexes, clean up permissions and and portlet preferences but to no avail.

Where else can I look, to find out, why my configuration is not registered in the control panel?