Fixed Days Supply - Weekly Buckets

In 12.06 for Unconstrained Planning we are using the Order Modifier "Fixed Days Supply" .Also when using Fixed Days Supply Modifier we are not using any other order modifiers.
The issue is Planning process does not consider the Fixed Days Supply value for weekly buckets.
If the Fixed Days Supply value is 5 days for Item at Org the planned orders are are created in weekly buckets for every 2 weeks.
For the Days bucket the Fixed days supply order modifier works ok.
Tried changing the profile option : MSC: Apply Lot Modifiers in Weekly/Period Buckets to YES without any .
Any idea why the planning engine is doing this?

When you use aggrregated time buckets (weekly in this case) plannign engine shifts the due dates of the demand falling in a particular bucket to the end date of that bucket. (for eg...demand of 100 nos of a finished good on day 2 of 2nd week will be shifted to last day of week 2nd week). So leadtime offsetting starts from the end date of the bucket and not from the actual demand date. This can result in shifting of planned order supply to a date that is beyond the timespan governed by "fixed days supply". (5 days in this case).Being so this supply will not be used while deciding planned order qty.
This is one possible reason.....pls check this out.
Regards,
Utkarsh

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