Solution : https://service.sap.com/sap/support/notes/661434 (SAP Service marketplace login required)
Key words : 
short-term planning horizon reason, short-term planning horizon, solution fiscal year variants, system issues message ma120, technical fiscal year variant, fiscal year variant, planning table, period variant &, receive message, technical periods
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods |