BI Publisher - pulling Candidate Source Medium and Source

Summary:

We have a BI publisher report that we want to use to report on Candidates who are specifcally coming from these two Source Mediums: Referral and "Candidate added to job requisition". We have the code for Referral as ORA_REFERRAL. Where can I find what the code is for the Source Medium Candidate Added to Job Requisition so we can add it to the report? Where are these codes stored in general? Thank you!

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

Decode(iddb.SOURCE_MEDIUM,
       'ORA_REFERRAL', 'Referral',
       iddb.SOURCE_MEDIUM) Source_Medium,