Please go through the suggestion given by Raymond MoynihanRaymond Moynihan
You may post as a means of Unplanned depreciation either by ABAA or ABSO or AB01 by using the relevant transaction type. But, please note, that the Unplanned depreciation behaves differently to normal depreciation.
As soon as the normal depreciation is posted, the future ordinary depreciation for that year would be adjusted. Whereas, in case of unplanned depreciation, the ordinary depreciation for the current year remains the same, only from the next year the ordinary depreciation gets recalculated. This is the standard behaviour, you cannot change this.
You should understand that the recalculation of depreciation cannot happen for closed fiscal years.
Try to use write-up wherever needed.
Regards,
Ravi