Hello,
I have tried to explain my scenario through the below tables
FOR stands for Forecast ( Actual Forecast, Modified Forecast, New Forecast )

STAGE 1 - Initial table in SAC
STAGE 2 - Manual value modification and update
STAGE 3 - Data update/correction
STAGE 4 - Manual value deletion and update
All actions till stage 3 can be done. But I am not able to implement stage 4.
Any suggestions?