depriciation problem

Dear Sir,

Per day wise depriciation calculation is possible in sap,

so my question is that, if my depriciaion from the month jan to dec 2009 is Rs. 100, but the same is sold by dt 25 dec 2009. so as per that my depriciation is Rs 98.00.

so while running the depriciation it post Rs 100 to depriciation & accumalted depriciation a/c, & while sale of asset it is posting Rs 98.00.

I want to run the depriciation for the specific period with Rs 98.00 instead of Rs. 100.

please let me know How to do it???

Thanks & regards,

Nikhil Surve