Star Wars Knights of the Old Republic II: The Sith Lords

Why is the wheel on my Logitech mouse not working properly with Star Wars Knights of the Old Republic II: The Sith Lords?

When using a Logitech Wheel Mouse, the mouse wheel may not work in the game. If this occurs, the scrolling size may need to be set to none in the Mouse Properties under the Buttons tab. This option is located in the Logitech Control Panel. The web wheel should also be disabled by setting Button 2 to the middle button.

NOTE: This may deactivate the mouse wheel in other applications, such as Microsoft Internet Explorer.