Hi All ,
Thank you all for the suggestion you have given to me.
@Marius talos - We cannot use that settings in the heuristics because the business wants the old planned should be deleted and new should be created and if they want to retain the order they will "date fix" it .
Let me tell you how system is behaving in my case.If you closely observe my screenshot no 3 , the orders which are generated again with same quantities has start date as 19:43.That was the exact system time when I ran the product heuristics.If you consider the order with 40 pieces which is firmed has end time as 19:53:27 and the new order created by heuristics has start time earlier than the end time of earlier one and hence the new orders are generated.Its the same case with other orders as well.
I am still confused why there is a need of creating a new orders because we already have one which is covering the old demands.
Issue rectified
We actually have different issue.Planners used to set the orders created by the heuristics prior to demands which is in past and fix it (Date Fix) so that heuristics cannot change the orders.But in our project we are daily running the "BOM Explosion" heuristics with retain operation date and modes.After testing I understood that this heuristics bring back all the past "Date Fix" planned orders to current date.The horizon we used earlier for BOM explosion was from W0-W12.But to avoid facing this issue we change the time profile from D1-D84 . So now our BOM explosion was working from Today+1 day till D84.With this change all the firmed planned orders are now untouched in past.Currently we are able achieve the business requirement with this.
But still I could not understand the working of the standard heuristics and BOM explosion heuristics in my case
1. The main purpose of the heuristics is to avoid surpluses and created orders on the basis of lot for lot.System has done that but when we firmed the planned orders why system is creating duplicate orders.Why system is considering the dates when creating extra orders with same quantity.
2. What I understand about the explosion heuristics is that when we set the "Retain operation date" , it should not reschedule the orders .It works well on current day orders and the orders in future days but it is rescheduling all the past fixed orders to current date.
Thanks
Debasis Nanda