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Introduced in build 8.4
Description
Returns the base item index of a data field in the PivotTable.
C#
vb.net
Remarks
Value label fields return -1. You can check if a PivotField is a value label field with the IsValuesLabel Property
When calling SetShowValueAs(), certain ShowValueAsTypes use a source field as a base field and an index for one of the values in the data source column associated with the source field.