Indicate what level an overridden setting comes from

For reports my team releases, we have a hierarchy like this.

Customer administrators aren't allowed to modify the base settings, but they can set overrides one level below. Copies of the report can then be created which further allow settings to be overridden. When working with a copy of the report, users see a screen similar to this.

The first column of values indicates the currently applicable value, from either the base settings or the customer overrides. The second column allows users to enter in their override values.

We'd like to modify this form to give some indication of where the active value is coming from, the base settings or the customer overrides. What's the best way to do that without introducing a lot of clutter into an already cramped form?