Period control key for Indian IT depreciation

Hi All,

I have a problem in asset accounting.  My company code is using Jan-Dec fiscal year. For IT depreciation (180 days rule) we have to calculate depreciation for full year, if we do asset acquisition till end of September and 6 months depreciation, if we do asset acquisition after September 30^th till March 31^st.

How to define the period control key? If I specify the period control keys as below, since the month in this configuration is calendar month, it will take till 30th june full year and till 31^st dec, 6 months depreciation.

Month     Day     Period

6             30      0

12           31      6

Shall I maintain it like following?

Month Day     Period

3         31      6

9         30      0

12       31      6

I am not sure since the fiscal year for first entry will be last fiscal year as per April-Mar fiscal year.
Do you know any other alternative? Let me know if you need any additional information.

Regards

Suresh