Hi Gaurav,
You have assigned the custom activity function in Rule set in SAP EM.
Follow the below steps.
1. Put the breakpoint in /SAPTRX/LUIMMSGF02 (FORM SEND_MESSAGE) -> /SAPTRX/BAPI_EH_ADDEVENTMSG_02 and your custom functional module.
2. Run Tcode /SAPTRX/MI02
3. Enter Tracking ID Code Set and Tracking ID Code ID
4. Press Go
5. Enter Date in your custom events
6. Start debugging.
Check and let me know if you are looking for the same thing.
Regards
GGOPII