CMS$DW_HELP.HLB  —  M  M_M, My mi, My e, My a
  Click on the Allow Concurrent Reservations button
  to specify that this element can have multiple
  reservations.

  Click on the Off button to specify that the element
  cannot have multiple reservations.

  If you do not specify this option, CMS will maintain
  the existing concurrent reservations attribute (that
  you specified when you created or previously modified
  the element).
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