HIGH PRIORITY:Automatic calculation of Allowable Depreciation using Dep key

Question

HI SAP Gurus,
Please help me on this requirement ASAP:
Asset: 10008009
Asset class AM&E
Acquisition cost: JPY2,731,807
Acquisition date: Apr.25,2007
Depn key: ZA10
Life: 8Year (0.25)
expected value for asset number 10008009 is as follows,
Year           depreciation          Net book value
Y2007        JPY341,476        JPY2,390,331    (2,731,807x0.25/12*6month)
Y2008        JPY597,583        JPY1,792,748    (2,390,331x0.25)
Y2009        JPY448,187        JPY1,344,561    (1,792,748x0.25)
Y2010        JPY336,140        JPY1,008,421    (1,344,561x0.25)
Y2011        JPY252,105        JPY   756,316    (1,008,421x0.25)
Y2012        JPY189,079        JPY   567,237    (   756,316x0.25)
Y2013        JPY141,809        JPY   425,428    (   567,237x0.25)
Y2014        JPY106,357        JPY   319,071    (   425,428x0.25)
Y2015        JPY  79,768        JPY   239,303    (   319,071x0.25 <  319,071-2,731,807x0.05)**
The remaining value of asset reaches 10% of acquisition cost in FY2015, thereafter, the remaining value can be depreciated at the same year (allowable limit for depreciation is (NBVx0.25)).
Y2016        JPY  59,826        JPY   179,477 (239,303x0.25 < 239,303-2,731,807x0.05)**
Y2017        JPY  42,887        JPY   136,590 (179,477x0.25 > 179,477-2,731,807x0.05)**
*Either of lower value, allowable limit for depreciation (NBVx0.25) or remaining value of asset reaches 5% (NBV-(Acquisition cost0.05)) is applied.
The allowable limit for depreciation as a limit, and depreciation is continued until the net book value reaches up to 5%.
Surely the net book value at the end of year 2015 shows a value of JPY 136,590 which is equal to 5% of 2,731,807. However, the allowable limit for depreciation also need to be considered.
Is the above scenario possible in SPRO? Please give me a call to discuss.
Regards,
Sreeni
[phone]

Answer 1

I think I had the cart before the horse on this problem.  The correct way to look at this is what is the best way to get the correct "Net Book Value" and not the correct tax depreciation posting as it never actually gets booked.  
By knowing the incorrect Beginning BV, the rate depreciation is applied in year 1 and finally the desired Net BV value at the end of year 1 for tax purposes I am able to calculate the correct Unplanned Depreciation for tax to make everything work out correctly.
correct beginning tax BV $1,200
Beginning Asset Book Value $1,800
depreciation $360 (20% of BV)
Unplanned depreciation  $?
Net BV for tax at end of Yr1  $960 ;  or  1,200 - (1,200*.2)
With the know values above that makes my unplanned depreciation for Yr 1 to be $480.  Year 1 and all following years depreciate correctly after the Unplanned Depreciation is posted.
I am marking this as resolved unless someone sees an error in my thinking.
Thanks,
Jeff