Job Scheduling for Expected Event Monitoring

Hi,

I am trying to schedule a job for expected event monitoring "/SAPTRX/EE_MONITOR", but when i schedule the job hourly then the job is getting overlapped with the privious one which is producing dump - DBSQL_DUPLICATE_KEY_ERROR.If we have to run this job hourly only then how can we schedule the job is such a way that each time when job runs it will check  for the completion of privious job.please suggest.

Thanks

Vaibhav