【FI-AA】asset depreciation within 3 years

Dear all,

I have an issue with newly created depreciation key.

I would like to caluculate yearly depreciation with not considering monthly depreciation in AW01N.

e.g.)
・useful life 3 years
・acq val 1,200.00 USD
・acq date 2020/08/01

■NOW（issue）
2020 -> 1,200 * 5/36 = 166.67 USD
2021 -> 1,200 * 12/36 = 400.00 USD
2022 -> 1,200 * 12/36 = 400.00 USD
2023 -> 1,200 * 7/36 = 233.33 USD

■ToBe
2020 -> 1,200 * 12/36 = 400 USD
2021 -> 1,200 * 12/36 = 400 USD
2022 -> 1,200 * 12/36 = 400 USD
↑ regardless of asset acq date, depreciation value should be calculated evenly from its useful life.
Also depreciation should finish at the end of 3rd year.

Is it possible to implement this depreciation?
Which base method, period control and multi-level key should I set to depreciation key?
Please give me some advise.

Regards,