When in pivot table a item in a field is empty, if is present a pivot function
that takes a value insite pivot, the conversion of this function isn't correct.
The syntax for this Excel function is (italian version):			
=INFO.DATI.TAB.PIVOT("AMOUNT";$G$1;"OFFICE";"B";"YEAR";2006;"VOICE";)
it is converted as:
=GETPIVOTDATA("AMOUNT";$G$1;"OFFICE";"B";"YEAR";2006;"VOICE")

The conversion should put "" (2 contiguous quotes) to indicate empty value 
because CALC function use this method to rappresent it.

For example I write the correct conversion that CALC should do:
						
=GETPIVOTDATA("AMOUNT";$G$1;"OFFICE";"B";"YEAR";2006;"VOICE";"")