ADE output calculation from other expression not working

Hi Cadence,

I recently moved from using IC 6.1.6 to IC 6.1.8.

In IC 6.1.6, I always calculated my efficiency by first calculating PIN,POUT, and PGATE from expression and re-used the names of expression to calculate the efficiency (EFF).

However, when I try the same steps in IC 6.1.8, PIN, POUT, PGATE are successfully calculated, but EFF is not outputing anything in ADE as shown below:

The expression for EFF is set as below:

When I try to calculate EFF from ADE, it returns the following message:

However, when I copy the exact same expression to calculator and calculate it there, it returns the correct value.

I want the expression EFF to be calculated under ADE automatically at the completion of simulation. (Which was possible in ic 6.1.6)

Is there a workaround for this issue?

Thank you,

Jin