What is UID_PWORulerOrigin

I'm using version 8 and creating a new Approval Procedure. The documentation says that I need to pass back a the uid of the approver/s and also a value for UID_PWORulerOrigin. The documentation doesn't tell me what's supposed to be fed into UID_PWORulerOrigin though. It suggests a SQL Function to use dbo.QER_FGIPWORulerOrigin and in the examples an XObjectKey is passed to it but I don't understand what the value is used for or what I should pass it. My Approval Procedure is fairly simple, it's just the manager of the uid_personinserted so that part is fine, just don't know what to pass as the second parameter.