How to visualize if a value is greater or smaller than another?

Hi Community,

I'm totally new to WEBI so bare with me please Image may be NSFW.
Clik here to view. .... this questions might be very easy to solve.

I try to create a WEBI report which is based on a data-source which comes from another vendor.

The report includes three variables:

1. Device-Name (Type: String, Qualification: Dimension), Example "Router1"
2. *Device-Availability% (Type: Number, Aggregation: Sum, Qualification: Measure), Example "99,52 %"
3. Device-Availability-Target-String (Type: String, Qualification: Dimension), Example "97,50"

I want to setup a new column which will be filled with a green background color, if the *Device-Availability% >= Device-Availability-Target-String

and else with a red color.

First thought was to simply use an Alerter combining both variables but that doesn't work. So next thought... okay comparing a String with a Number

will not work. So I created a new variable (Measure) Device-Availability-Target-Number (=ToNumber([Device-Availability-Target-String]) and

tried those two variables in an Alerter. But again, no success.

Also tried using an If-Function but same result. It looks like WEBI compares the two variables in a way that I don't get.

Any ideas, any hints will be appreciated... I'm desperate Image may be NSFW.
Clik here to view.

Thanks a lot,

Lemmy

Here is an Example of the table I'm using.