I’m not sure I have an answer on that one. In the window where you define the graphical indicator formulas, it indicates that rules are applied in the order listed and that processing stops on the first successful test. Is it possible that the sequence of the rules need to change? One other remote possibility. What type of customization field are you using? Is it possible that the field type doesn’t allow negative values? Might I suggest a few tests without the graphical indicators to see what values are actually showing up in the field after the calculation. In this manner, you can at least determine that the problem is either in the calculation or in the graphical indicator translation of the value.