Hi,
In tree map if we are using Role > color, then three colors whichever you define in style > gradient are used and these colors are applied by using relativity.
E g - If we define Achievement Percentage in Role > Color and used default colors in style>gradient (Red,Yellow,Green) then tree map will appear in the shade of three colors Note- These shades are automatically defined on the basis of relativity of defined role (Achievement Percentage).
Now if we use display rules that means we are over-riding automatically defined colors using gradient colors so the warning appears.
So to avoid warning message its good not to use Role > color (making gradient colors not effective Note- Fill color is still effective) and only use display rules to define colors of tree map that means define colors for all ranges of Achievement Percentage.
Hope this helps.
Regards,
Pcp.
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