A quick family tip

When adding Length parameters between Reference Planes in the Family Editor, it sometimes can be hard to make Revit understand which Ref.Plane to move when the parameter is changed. I tried adding Witness Lines in different order, Ref.Planes in different order, changing Ref.Plane Is Reference, adding name, and even setting Origin, but nothing seemed to give good and consistent results. Until I tried the easiest (and perhaps less intuitive) of them all: Pin and Unpin the Ref.Plane.