VMS Help  —  DEFRAGMENT  MODIFY  Restrictions
    o  A script that has the /CONTINUOUS qualifier may not be named
       as the predecessor of another script.

    o  If you specify the /INTERVAL qualifier, the /PREDECESSOR
       qualifier is not allowed.

    o  If /LEVEL=5 is selected, the /LOG qualifier is required.

    o  Do not use /BRIEF and /FULL concurrently.

    o  Do not use /CONTINUOUS and /INTERVAL for a script.
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