How do I create relative properties for the timeline?

I've been playing with timelines lately but I always get stuck when it comes down to use the timeline for another instance (a different object).

The problem is that the timeline doesn't respect the relativeness of the properties as it should. For example, if you have 2 objects from different sizes, the timeline will follow what was applied for the first (main) object and ignore the size of the second object making it weird.

Example file » dropbox.com/s/wpibdawkrwu4x6z/timelineexample.c3p

Let me know if you guys can make it work the same (relative) for both objects without messing up the properties.

I don't think the percentage (relative) is working.

I tried your file after your first post, and couldn't get it to work either.

But I had not done much with timelines, so I wasn't really sure how it was supposed to work. Might be a bug.