Suresh,
The traffic lights (Ref. field monitor) in the QM11 ALV tell about the status with reference to Required Start and Required End dates
Place the mouse tip over the Traffic light when the tooltip text will appear. It says.
Red light --> Required End Date Exceeded
Yellow light --> Required End Date Not Yet Reached
(Means current date is in between Required start and Required end dates)
Green light --> Required Start Date Not Yet Reached
Regards
KJogeswaraRao