Library /sys$common/syshlp/BASICHELP.HLB  —  Run time errors, INVKEYREF
  Invalid key of reference (ERR=144)

  The program attempts to perform a GET, FIND, or RESTORE on an  INDEXED
  file  using an invalid KEY, for example, an alternate KEY that has not
  been defined.  Use a valid KEY in the GET, FIND, or RESTORE statement.
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