Bingo...
This formula does not work in cross tab when you want to show Yes or NO in cells.
=If(IsNull([Dsply Nm])) ForAll( [here put dimensions except [Display Case ID]] ) Then "No" Else "Yes"
however if we tried following then it works
=If(IsNull([Case ID]))Then 0 Else 1
Then format the number by customizing '0' as Yes and '1' as No. in Format number custom properties.
problem solved.