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{introducedin: 8.4}

{description}
{excerpt}Returns the base item index of a data field in the PivotTable.{excerpt}
{signature:C#}
 public int BaseIndex{ get;}
{signature}{signature:vb.net}
Public Property BaseIndex() As Integer
{signature}
{remarks}Value label fields return -1. You can check if a PivotField is a value label field with the [IsValuesLabel |EW8:PivotTableField.IsValuesLabel]Property

When calling {{[SetShowValueAs()|ShowValueAs.SetShowValueAs (ShowValueAsType, SourceField, Int32)]}}, 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.
{remarks}