SCHID is using to schedule the same job at the different times. We are using SCHID as ID in the JCL too. Example, especially it is useful for backup jobs. The backup job must run different times in a week. It runs as a daily for incremental back up and it runs as a weekend for full backup. The same backup job can get both incremental and full backup by using #JI,ID=x (JI: Job Include or JE: Job Exclude) scheduling utility in the same JCL.