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Returns the base item index of a data field in the PivotTable.

 public int BaseIndex{ get;}

Public Property BaseIndex() As Integer

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.