Our requirements for calculating depreciation is like this
Asset purchased in April 2007, Useful Life = 3 years. Method of Depreciation Declining and then shift to Straight line once the straight line is more.
As per SAP the asset will get depreciated in March 2010, but customer requirement is that it should be depreciated by 2009 end only and those 3 months of 2010 should be taken in 2009 only. which is like to have speedy depreciation.