Depreciation does not extend after the Shortened Fiscal Year

Question

Fiscal Year variant setup in OB29:
For Company Code assignment in FI year 2010 to 2020-
Z6 year-dependent July - June, 4 special periods 12periods 4special periods
For 2012 it is shortened to 11 periods, all other FY have 12 periods.
For Asset Accounting FY Variant assigned to Company Code assignment in FI-AA -
Z7 year-dependent July - June, 4 special periods 24periods 4special periods
For 2012 it is shortened to 22 periods, all other FY have 24 periods.
Period Control Method set is Z7/Z7/Z7/Z7
where Z7 is defined in OAVH as (for year 2010, 2011, 2013, 2014-2020):
Z7 Z7 15th of every month 2010 1 15 11
Z7 Z7 15th of every month 2010 1 31 11
Z7 Z7 15th of every month 2010 2 15 13
Z7 Z7 15th of every month 2010 2 28 13
Z7 Z7 15th of every month 2010 3 15 15
Z7 Z7 15th of every month 2010 3 31 15
Z7 Z7 15th of every month 2010 4 15 17
Z7 Z7 15th of every month 2010 4 30 17
Z7 Z7 15th of every month 2010 5 15 19
Z7 Z7 15th of every month 2010 5 31 19
Z7 Z7 15th of every month 2010 6 15 21
Z7 Z7 15th of every month 2010 6 30 21
Z7 Z7 15th of every month 2010 7 15 23
Z7 Z7 15th of every month 2010 7 31 23
Z7 Z7 15th of every month 2010 8 15 3
Z7 Z7 15th of every month 2010 8 31 3
Z7 Z7 15th of every month 2010 9 15 5
Z7 Z7 15th of every month 2010 9 30 5
Z7 Z7 15th of every month 2010 10 15 7
Z7 Z7 15th of every month 2010 10 31 7
Z7 Z7 15th of every month 2010 11 15 9
Z7 Z7 15th of every month 2010 11 30 9
Z7 Z7 15th of every month 2010 12 15 11
Z7 Z7 15th of every month 2010 12 31 11
(for year 2012 where it is a shortened FY):
Z7 Z7 15th of every month 2012 1 15 13
Z7 Z7 15th of every month 2012 1 31 13
Z7 Z7 15th of every month 2012 2 15 15
Z7 Z7 15th of every month 2012 2 28 15
Z7 Z7 15th of every month 2012 3 15 17
Z7 Z7 15th of every month 2012 3 31 17
Z7 Z7 15th of every month 2012 4 15 19
Z7 Z7 15th of every month 2012 4 30 19
Z7 Z7 15th of every month 2012 5 15 21
Z7 Z7 15th of every month 2012 5 31 21
Z7 Z7 15th of every month 2012 6 15 0
Z7 Z7 15th of every month 2012 6 30 0
Z7 Z7 15th of every month 2012 7 15 1
Z7 Z7 15th of every month 2012 7 31 1
Z7 Z7 15th of every month 2012 8 15 3
Z7 Z7 15th of every month 2012 8 31 3
Z7 Z7 15th of every month 2012 9 15 5
Z7 Z7 15th of every month 2012 9 30 5
Z7 Z7 15th of every month 2012 10 15 7
Z7 Z7 15th of every month 2012 10 31 7
Z7 Z7 15th of every month 2012 11 15 9
Z7 Z7 15th of every month 2012 11 30 9
Z7 Z7 15th of every month 2012 12 15 11
Z7 Z7 15th of every month 2012 12 31 11
Depreciation in 2012 for assets are as expected with 11 periods. Half month's depreciation posted in the month of acquisition, and the following months are calculated accurately up to period 11.
In FY 2013, June and July are in Period 1.
For FI Posting, this is true and correct.
For Depreciation Posting, only one year's depreciation is calculated but we need 1 year + 1 period (because the previous year was shortened by one period).
Is there a setting to increase the depreciation or extend the depreciation for 1 period in 2013 that was reducde in 2012?       
The shortened Fiscal Year changes are not in productiveness. The assets created are new assets such as in a normal operation when shortened Fiscal Year has been in place. As such, new assets have no expired useful life yet and it is newly capitalized.
No user exits or custom development is in place.
I have checked all the following notes, either they made no changes or were not relevant:
58443
183546
397925
1572545
210214
26891
83213
506632
1021326
1010159
515571
123026
799719
672255
428292
160093
The depreciation calculation is lacking/missing one period of depreciation eventhough depreciation is not reduced.
Please suggest any possible solution to this issue that we are facing. Thanks!

Answer 1

Please check SPRO transaction AFAMA for the Depreciation Keys:
Setting:
Depr to the day
No reduct in short year
Period control according to fiscal years
Check which is appropriate starting with the above order as I think this will fit your logic. But this depends on whether postings have already been made in the periods you want adjusted. If so then you need to use AFAR and choose repeat run after you have changed your config settings for the periods already posted. Additionally you may have problems if you have rolled forward your Fiscal Year in Assets and you will/may need to roll it back if possible before running AFAR etc.
SAP normally calculates depreciation for straight line by taking the number of periods in a year and dividing total depreciation for that year by the periods and posting that figure for the month. If you set Depr to day then it will take into account different months day length etc.
No reduc in short year would also solve your problem but would reflect the full year depreciation in the shortened year (12 periods not 11).
Hope this helps if its not to late.