Comment 0 for bug 1776995

I'd like the relate a subordinate service, ntp for example, to multiple applications, some of which are on xenial and some of which are on bionic. Since the ntp charm supports both xenial and bionic, it seems like this should be possible, but it isn't:

http://paste.ubuntu.com/p/Dh9dPzvwVC/

Instead, I need one subordinate application for each series, which complicates my model and operations.