Data collection task in Update mode is not posible with Original list

Hi Friends,

When I try to Execute the Task for data collection in sa38.I am getting the Error with in 9 sec.

UPDATE MODE IS NO POSSIBLE WITH ORIGINAL LIST

Message No. UCS0111

Diagnosis :

If you select the indicator"original list"the current task status is ignored.In this case,the system simulates a task run in with all of the organisational units are not yet blocked.Thus,setting this indicator is meaningful and valid only if the task is executed in test mode at tthe same time.

procedure : select the original list & Test run together.

My problem is I can not select the Test run in production server.

Can any one please help me to solve the Issue.