CA 7 submitted JCL can have more than one JOB statement within a member which can cause security issues.
If you do not want CA 7 to submit JCL that contains multiple JOB statements, specify MULTIJOB=FLUSH on the OPTIONS statement in the initialization file. Using MULTIJOB=FLUSH will cause the "first" part of the JCL to be submitted up to the second JOB statement, which will be "flushed" instead of submitted.