Dep .not calculating for useful life 3 years

Hi all,

I have created one dep.kep with 33.333% (For 3 years).

when ian running AFAB the whole depreciation calculated in 3 moths not in 3 years.

Eg:

Cost- 120,000

Legacy Dep: 34,740

Net Value- 85,260

Aquisation -19-May-09

The system showing in aw01n -

Planned amount 1 32876.00

Planned amount 2 33973.00

Planned amount 3 18411.00

it is cleared in 3 months only but it should be clear in 3 years.

please help me out.

Krishna