fixed asset

anjali

hello everybody,
i have a problem in Fixed Asset.
suppose we havebought an asset for Rs. 10000, depr. at declining balance 1method @10%p.a. for 2 years.
the depr. is as follows:
10000
-1000 (1st yr)

---

9000
-900 (2nd yr)

---

8100

now Appreciation takes place by Rs. 9000
i want the depr. of the appreciated portion @ 5% p.a.
how to show that????????????
in navision at present it is showing:
Rs. 8100+ Rs.9000= 17100*10%=1710.

but what i want is :
8100*10%=810
and
9000*5%=450
so total depr. should be -- 810+450=1260

HOW TO DO THIS ? IS IS POSSIBLE?

HELP

ANJALI