Color Bar Chart by calculated dimension

[#1]

Hi everyone,

I have a little coloring problem within one of my bar charts.

My Dimension definition looks like:

=If(DATEDIFFERENCE >=20,dual('20 or more',20),If(DATEDIFFERENCE < -5,dual('-6 or less',-6),dual(DATEDIFFERENCE,DATEDIFFERENCE)))

And my backgroundcolor definition on my expression states:

If(DATEDIFFERENCE <= 0,Green(),Red())

Unfortunatly "-6 or less" is colored red, although I want it to be colored green. Everything else works just fine. Has anyone an idea, how to accomplish this?

Thanks in advance,

Claus