SCCM 2012 - Configuration Item / Baseline Compliance Problem

I am in the process of creating a baseline to check that all required applications are installed on clients.

This script install application has the following Detection Method:

When creating the Configuration Items I have left the Detection Method as "Always assume application is installed" (this may be the issue!) I then created the following Settings item:

I created a test Configuration Baseline and deployed this to my test collection.

This reports as being Compliant (great!) so to test for non-compliant I edited the registry setting on the device for the PowerShellVersion from 4.0 to 3.0.

Unfortunately this still shows as being compliant after evaluating the baseline.

What is the correct way to set up the Configuration Item in this instance?

Thanks in advance.

Clint