Hi Romeo
Thats possible to set up for 5 sec interval but how long does that job runs?
For example if it takes more than 5 sec to run then system will give an error message
Preceding job not yet completed"?
I am assuming your job is failing coz of the overlapping If yes you may want to modify your trigger which means:
In custom program to trigger the "actual job" if there is no "active job" running. If it is running then
check again after 5 sec and when it is completed then run the " job".
However if some other reason you may want to debug and check .
Job Start Management - Background Processing - SAP Library
Processing Sessions Automatically - Managing Batch Input Sessions - SAP Library
http://scn.sap.com/thread/1436835
Regards
Vinita