The REJECT GENERATION command changes the review status of
    each specified element generation from "pending" to "rejected"
    and removes it from the review pending list. You can use this
    command only on element generations that have reviews pending
    (see the description of the REVIEW GENERATION command for more
    information).

    If you attempt to reserve a generation that has been rejected,
    CMS issues a message stating that the generation was rejected,
    and then prompts you for confirmation. Additionally, further
    generations created from a rejected generation are marked for
    review, regardless of the element's review attribute.