A short time ago I had been involved in the development of several Fast Formulas in Fusion Absence Management. And I ran into a real problem when I started to debug fast formulas.
First of all let me say a few words about Fast Formulas(FF) in Oracle Fusion HCM. Besides, FF used to create calculation logic for payroll elements in the Oracle Payroll module, this is a very powerful approach to extend business logic in several modules of Fusion HCM (such as Absence Management, Benefits, Workforce Compensation). You can read the following document for details: http://docs.oracle.com/cloud/latest/globalcs_gs/FAIAM/FAIAM1453275.htm#FAIAM1453275
The main problem with debugging of FF in the Cloud environment is that you don’t have access to the server side logs. While I was working with Oracle E-Business Suite I used to work with PYUPIP for debugging purposes. You can read more about PYUPIP here: Using PYUPIP in Oracle HRMS (Doc ID 130374.1)
After some investigations I have found the way how to trace Fast Formulas in the Absence Management. You can use ESS_LOG_WRITE() function to write messages into ESS log which can be accessible from user interface.
Original copy of this article you can read on my Oracle community blog https://community.oracle.com/blogs/volodymyrfar
I hope this trick will be useful for those who work with Fast Formulas in Oracle Fusion HCM.