Hi Rakesh,
The following link describes the function of APO's time based disaggregation based on technical periods used based on storage bucket profile with an example.
http://help.sap.com/saphelp_SCM700_ehp02/helpdata/en/26/53f1f3758211d398490000e8a49608/frameset.htm
Here is the link about aggregation and disaggregation methods. You need to verify the time based disaggregation type assigned to your key figure (t.code /SAPAPO/MSDP_ADMIN - key fig details) and then compare the results based on the above link.
Thanks,
Rajesh