Thanks for your response.
But, if I put it as a default macro, it will be executed for all Materials right. I don't want to execute it for all materials.
I just tried it by putting that macro in Default, but the problem is, it is coloring that cell (01/2015) for all materials, I don't want to color all materials, I only want to manually hit that macro button for certain materials where the review is needed next month .
Basically, Planner will have to manually execute that macro button in the planning book to color it.
Then, next month they will get an alert for that material if there is a color for that cell. If they decided they don't need to review it anymore then , I have another macro button to de-color it, that means that material doesn't need a review anymore.
Thanks,
Swathi