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  Telcontar120 Moderator, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,635 Unicorn

  February 2019 Solution Accepted

  All special attributes (including id) are not included as predictors in modeling.
  You can't have more than one attribute with the role of id in the dataset at one time---if you try to do this, it will "unset" the prior id.  So the only way to have multiple id columns is to give the additional id columns custom special role names (which you can always do) such as id2 and id3.  
  
  

  Brian T.
  Lindon Ventures 
  Data Science Consulting from Certified RapidMiner Experts

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