cannot read column "<str>" from target row during INSERT

  Explanation:  The AUTOMATIC column attempted  to  reference  the
  row being inserted.

  User Action:  AUTOMATIC columns can not reference the target row
  during  insert  because  the  data  may  not  yet  be completely
  materialized.  Correct the AUTOMATIC column definition to either
  be  UPDATE  (which can reference the old row version), or rework
  the value expression to avoid reference to the inserted row.