Application logging records the progress of the execution of an application so that you can reconstruct it later if necessary. Whereas the system log records system events, you can use the application log to record application-specific events. Use the transaction SLG0 to define entries for your own applications in the application log. Use the transaction SLG1 to analyze the application log.
The application log is a table structure consisting of several tables. Applications write their entries to these tables using SAP function modules. (These modules conform to the SAP authorization concept.)
You can also find out who accessed these function modules over a where-used list by using the report RSFKT100 (function group: SLG0).
For more information, see Create application log.