Hello, I have this indexer for one document type, I have tried to add another docType with the same properties alias but didn't succeed, any idea?

Thank you

<IndexSet SetName="PlaceIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/Place">
    <!--the standard properties-->
    <IndexAttributeFields>
      <add Name="id" />
      <add Name="nodeName" />
      <add Name="updateDate" />
      <add Name="writerName" />
      <add Name="path" />
      <add Name="nodeTypeAlias" />
      <add Name="parentID" />
    </IndexAttributeFields>
    <!--the document type properties we created - use exact alias-->
    <IndexUserFields>
      <add Name="placeName"/>
      <add Name="placeAddress"/>
    </IndexUserFields>
    <!--confine to nodes of document type Alpha-->
    <IncludeNodeTypes>
      <add Name="place"/>
    </IncludeNodeTypes>
  </IndexSet>