Backward Scheduling Issue

Hi,
I have an issue when SAP performs backward scheduling to get the production order finish dates.
As an example, if the Basic finish date is Tuesday 01/27/2009 (00:00) then when SAP performs backward scheduling it comes up with the following dates & Times:
Basic Start Date - 01/22/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2008
Scheduled Finish Time - 24:00
Scheduled Start Date - 01/22/2008
Scheduled Start Time - 13:17
If the Basic finish date is Monday 01/26/2009 (00:00) then when SAP performs backward scheduling it comes up with the following dates & Times:
Basic Start Date - 01/21/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2008 instead of 01/19/2008
Scheduled Finish Time - 00:00 instead of 24:00
Scheduled Start Date - 01/21/2008
Scheduled Start Time - 13:17
Could someone please explain as to why this is happening?
Thanks,
JP

Sorry about that. All the dates are in 2009. Here is the updated information
Case 1:
Basic finish date is Tuesday 01/27/2009 (00:00)
Basic Start Date - 01/22/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2009
Scheduled Finish Time - 24:00
Scheduled Start Date - 01/22/2009
Scheduled Start Time - 13:17
Case 2:
Basic finish date is Monday 01/26/2009 (00:00)
Basic Start Date - 01/21/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2009 instead of 01/19/2009
Scheduled Finish Time - 00:00 instead of 24:00
Scheduled Start Date - 01/21/2009
Scheduled Start Time - 13:17
Saturday & Sunday are holidays. I have checked the calendar and it is not the issue. I would appreciate it if you could help me in this as this problem is driving me crazy
Thanks,
JP

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Edited by: Avinash Mohite on Mar 19, 2010 12:43 PM
Edited by: Avinash Mohite on Mar 19, 2010 3:14 PM

Hi,
I hope u r doing in this way:
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Our users have created a sales order on 20.1.10(wednesday). The required delivery date in sales order is 22.1.10. The system has calculated the material availiblity date as 20.1.10. But this is wrong since i have checked that follwoing is maintained in the configuration of shipping point and route.
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     if_weight_group         = us_grulg
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be reached with route 1.
10th - 2 days = 8th, so there is no need to execute the forwards scheduling as the customers requested delivery date can be met
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