ServerPac and SystemPac delivery of JES2, JES3, and SDSF

Only the latest levels of JES2, JES3, and SDSF are delivered in ServerPac and SystemPac. Starting with z/OS® V2R1, you cannot use earlier levels of JES2, JES3, or SDSF. You cannot reassemble your existing levels of JES2, JES3, or SDSF if they are not at the z/OS V2R2 level.