CMS> MODIFY LIBRARY/REFERENCE_COPY=[WORK.REFCOPY] "current
    test area"
    %CMS-S-MODIFIED, library [WORK.CODELIB] modified

      This command establishes the reference copy directory
      [WORK.REFCOPY] for the current CMS library. In addition, to
      update the reference copy directory, an element must be set to
      /REFERENCE_COPY. Thus, if these two conditions are met, each
      transaction that creates a new main line element generation
      also updates the reference copy directory.