Yes but Suresh that would stop all of those tasks which may not be what Chetan intended? Unless you can live with that Chetan? Lots of sites have IDOC workflow tasks turned on and never actually use them 
Chetan if its starting with an event, you should be able to see some info in the event log and or event browser (in SWEQADM) if you have those turned on. The Event Browser should at least let you see if there is any difference in the event container content when the event is triggered.
But I defer to those with greater IDOC knowledge that WE46/47 and SWEC would also be worth checking. BTW - just check if there is more than ORDR that may be triggering ORDRSP - e.g. ORDR_SUS ?