Library /sys$common/syshlp/SQL$HELP72.HLB  —  Errors  SQL_ERRORS, INVORDNUM
  ORDER BY number is less than 1 or exceeds count of select-list
  items

  Explanation:  The number in the ORDER BY clause, used to specify
  which expression from the select list to sort by, is bigger than
  the number of items in the select list or it is below 1.

  User Action:  Use a number which corresponds to an item in the
  sort list.
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