Conditional Formatting

Highlight a calculation, go to the property grid and find Formatting Rules and open the editor

Select the Edit Rule Sheet Button

Open

Once the Formatting Rule Sheet Editor is open, select the plus button to add new rule

Open

Set a condition by clicking in that field, it will open an editor to create a condition.  You can use the functions and fields selections to help you create your condition.

And then under formatting set what to do if it hits that condition.  In my sample I set to highlight it.

I also changed the formatting rule name

Then you apply the Rule by moving the rule to the right

Sample: