- where did you create the calculation (on the Criteria tab or in the pivot table options)?
- are you using a pivot table view?
- is the new column with the calculation added to the pivot (and not in the excluded part?)
I created the "New Calculated Item" on the pivot table view. This item is appearing on the pivot table; however, instead of showing the difference between A-B, it's showing a line for A and a line for B.