We need to change our depreciation method from Written Down Value to Straight Line Method retrospectively for last year as well which we have closed. I have tried changing depreciation key in asset master but it gives me recalculated depreciation only for current year. I think I need to post unplanned depreciation for last year. How to do this as there are some assets where my depreciation gets reduced and unplanned depreciation wont allow me to post positive values in depreciation. Your guidance is needed.