True if the PivotTable field or PivotTable item is a calculated field or item. Read-only Boolean.
For OLAP data sources, this property always returns False.
This example disables the PivotTable Field dialog box if the specified PivotTable report contains any calculated fields.
set pt = Worksheets(1).PivotTables("Pivot1")
For Each fld in pt.PivotFields
If fld.IsCalculated Then pt.EnableFieldDialog = False
Next