Example

   CMS> MODIFY RESERVATION/GENERATION=5/REMARK="Add new feature"
   _Element expression: SPEC.TXT
   _Remark: Modify the reservation remark
   %CMS-S-MODIFIED, reservation SPEC.TXT modified

     This command specifies a new remark to be substituted for the
     reservation remark that was specified when generation 5 of
     element SPEC.TXT was reserved. You must also specify the element
     expression, and its associated remark, which is logged in the
     history file.