Can you send a screenshot of the AFT panel/field that has %%SOURCETEST specified in it?
Also, have you tried, as a test, hard coding a path into the jobs SET variable field and ordering it via the GUI? This will confirm if Self Service is changing the behavior of the job or if it has the same issue irrespective of Self Service.
Thanks for the direction. I hard coded the path in the job's variable field and it worked. Realized I had a typo between the service rule and the job.