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Argument null exception thrown while changing the calculation type to DifferenceFrom, PercentageOf and some other types. Also null reference exception thrown while changing the calculation type to "Formula". Need to add the "BaseField" and "BaseItem" options in the PivotComputationInfo pop-up.
Replication Procedure:
1.Run the attached demo
2.Double-click "Amount" to bring up the pivot computation information dialog.
3. Change "Summarize Value By" to "Difference from".
4.Then click the "Ok" button.