Bonus Depreciation for the year 2010

Hello Gurus,

I need to configure for the bonus depreciation based on the newly enacted US law 2010. The requirement is, for the asset purchased between 3rd Jan 2010 through 07th Sept 2010, the bonus depreciation need to be calculated @50% as special depreciation. The balance need to be depreciated as ordinary depreciation for 2010 and the remaining periods. For the assets purchased between the period 08th Sept to 31st dec 2010, the bonus depreciation need to be100%.

Please let me know the step by step configuration that need to be done for:

1. Depreciation key M20S.

2. The base method to be maintained

3. The multilevel method

4. The period control method for depreciating the values for the above mentioned dates

5. The bonus depreciation need to be calculated only for 2010 and should not be calculated for 2011 and onwards.

Also please let me know if there is any SAP note for 2010 Bonus depreciation calculation

Thanks in advance.

Best Regards,

Sri