Motorola V600

The default light ID color setting is supposed to be overridden when a call comes in from a phonebook category with a different color setting chosen, so callers from a given category are displayed by the categorie's light color and general calls are displayed by the default color I thought. However calls from numbers in specific categories are coming in with the default color rather than the category's color, defeating the point of having different colors for different categories. I must be doing something wrong but I cannot figure out what. Please help.