Solution : https://service.sap.com/sap/support/notes/200877 (SAP Service marketplace login required)
Key words : 
additional key words xdaily, attached program corrections, symptom depreciation, period weighting, inexplicable depreciation, depreciation posting, prerequisites function, daily depreciation, full weight, depreciation calculated
Related Notes : 
       
| 1239568 | |
| 672255 | Shortened fiscal year/changing fiscal periods |