Fixed asset depreciation run date before acquisition date

Hello,

I have a Fixed asset, the acquisition date is 2013/01/01.

I set the depreciation run date as 2012/10/01.

When I run depreciation proposal, AX always calculate the depreciation from 2013/01/01.

Do you know how to make AX to calculate depreciation from 2012/10/01 (Depreciation run date)?

Thank you.