Calculation of start date with backward scheduling

Dear all,
I am facing an issue related to backward scheduling. I have requirement in which whenever backward scheduling is used, system should calculate from last activity to first for calculation of schedules which is fine. But when running scheduling i am giving finish date as input and system is always using start date as current date and not calculation last date from last. For example if i input finish date as 15 feb 2015, and there is only one activity of 15 days, system should count start date from 1 feb 2015. Please help me how i can achieve this, currently its always putting start date as current date.
My current settings are--
Project definition- WBS Scheduling profile- Backward scheduling
                              scheduling scenario- Free scheduling
Network-      Planning type- basic dates
                    Scheduling type- Backward
Please help.
Thanks

Dear all, this issue is resloved. Reason was that by default i am using forward scheduling for all project but in case of backward scheduling, user change schedule type at project definition and network. I was removing start date and putting finish date and running scheduling. Missing step from my side was i need to first copy date from top to down than run scheduling again.
Thanks.

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regards
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Calculation of start date with backward scheduling

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