Solution : https://service.sap.com/sap/support/notes/163998 (SAP Service marketplace login required)
Key words : 
additional key words t009, separate time buckets profiles, moved fiscal year variants, fiscal year variants, time buckets profile, fiscal year variant, planning 1 year back, general planning parameters, time characteristics, 1 year ahead
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods | 
| 576015 | Collective Consulting Note for Demand Planning |