Need to restrict the Assignment Category Based on selected Job

Summary:

Hi Expert,

I want to restrict the assignment category field values on position level based on the selected job.

I created one DFF on job level and assigned the EMP_CAT lookup to it.

Now, once the job is selected on position level, the assignment category values should be automatically populated based on the selected job.

I created this rule and it doesn't show any result.

Can you please have a look and let me know what I'm doing wrong here.

Thanks