Auto Generation of Job Code Not Working

Summary: The job codes are not getting auto generated. WE have used the option , "automatic prior to submission" in manage enterprise HCM information.

Content (required): But still its showing the job code to be filled , when a job is created. Any reason for this behavior? Am i missing any more setting? Kindly throw some light.

Version (include the version you are using, if applicable): 21D

Code Snippet (add any code snippets that support your topic, if applicable):