How to get the ESS log write of Payroll Fast Formula?

Summary:

We have created the Payroll Fast Formula and wanted to check it is working or not with help of writing the ESS LOG WRITE. 

I did the following to debug payroll:

1. Navigate to Manage Payroll Process Configuration page.

2. In Configuration Group detail section use the parameter name "Logging Category Detailed information that is used for investigating problems. Default: no logging."

3. Set Override Value to 'GMF'.

4. Save.

Also I used the functions below in the formula to output the messages to the ESS log file, but the messages are not appearing:

RET = ESS_LOG_WRITE('My debug message')

temp = PAY_INTERNAL_LOG_WRITE('HRX_SA_GRATUITY_CALC_170 ***** INSIDE THE SA_GRATUITY_CALCULATION *****')