Wrong Ordinary Depreciation Calculation when Unplanned Depreciation

Hi,

Purchased an asset on 01.12.2009 with 10 years of life (120 months) for 120000.

On 02.12.2009, posted an unplanned depreciation (transaction type group 84)

Fiscal Year is April to March.

The system calculates depreciation of 1000 per month for 4 months from 01.12.2009 to 31.03.2010 (total 4000)

120000 / 120 months = 1000 per month

From 01.04.2010, the system calculates depreciation on 96000 / 116 months (120 - 4) = 828 for remaining 116 months.

However, I would expect the system to calculate:

100000 / 120 months = 833 for 120 months from 01.12.2009

The system is considering the unplanned depreciation at the end of the year to calculate depreciation for the future years (months)

However, I would expect the system to reduce the amount of unplanned depreciation from the gross book value and calculate the depreciation on net book for the remaining life of the asset.

Is there a way that I can achieve this.

Thanks in advance for your time.

Regards,

Ravi