= 'SumOfNumber of bl''s'/ GETPIVOTDATA(" eBL%",$A$14)

I'm trying to create a calculated vield in my pivot table to find market
share or the sum of one record of data on the total of that data object.


However when I try to add the above mentioned calculation I receive the
following error message:

" Referencs, names, and arrays are not supported in pivot table formulas. "
Do you know any way to handle this error and accomplish what I want to do?

rgds
David