Once you have created an installation-defined attachment to JES XCF, IBM recommends that you keep that attachment active until the JES address space terminates normally (that is, when JES detaches itself from JES XCF). When the JES address space detaches from JES XCF, the system breaks the attachment and reclaims any resources held by that attachment.

If you decide to break an attachment to JES XCF, do so only when IXZXIT03 gets control during JES termination processing. Be aware that if a program attempts to use the group token following the detach, the token will not be valid and its continued use may cause unpredictable results.