Also, you don't need to use Sum(), it's for summing a range of values.
And I'm not sure what's going on with the square brackets you're using -
that looks really odd, the square brackets are used to denote instances
of fields.So your script should look more like:$ =
(PD1*DN/DV[WD1*CT])/BPYExcept, as I said above, I'm not sure what the
value in the square brackets is doing.Other than that you'll need to do
as George said you'll need to script for the null values in the fields
that are empty to st...