Library /sys$common/syshlp/CMS$DW_HELP.HLB  —  M  L m, Ur mi, Ur opb, Ur ogf
  Fill in the Generation field with the specific generation
  number of the reservation to be canceled; for example,
  3B2.

  If you have more than one reservation of the same element
  generation, you must choose the Reservation
  Identification option to unreserve the reservation.
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