Enable user level debug.

These profile option should be rarely changed at Site level.
Profile Option Description

FND: Debug Log Enabled
Using this profile option, Logging of debug message can be turned ON or OFF. This profile is available at user level

FND: Debug Log Level
This profile describes what kind of message will be logged when logging is enabled. There are six level of logging. These levels are

Statement – Set log level to statement when you need to see how your code inside a procedure is flowing.

Procedure – Set log level to Procedure when you are interested in knowing the value of input and output parameters of a procedure

Event – This could be used when you want to check if certain event has taken place, Such as a button is pressed in a form.

Exception – This should be used when you want to log all the exception encountered by a particular module.

Error – This should be used when you want to log all the error encountered by a particular module.

Unexpected – This is used for logging all the unexpected condition