Fast Formula using Department Trees

Summary

Looking for sample of using department trees in a fast formula

Content

Does anyone have any fast formula code for department trees?

Our requirement is that only employees in certain department trees should be eligible, which we believe will need to be done via fast formula since Department Trees aren't available in eligibility profiles.

We understand from the below linked post that we will need to "traverse through Department ancestors in while loop." But we are looking for an example of this being done.

https://support.oracle.com/epmos/faces/CommunityDisplay?commId=3701018&resultTitle=How%20to%20fetch%20department%20tree%20in%20compensation%20plan%20using%20fast%20formula?&displayIndex=2&resultUrl=https://community.oracle.com/thread/3701018"