Solution : https://service.sap.com/sap/support/notes/497034 (SAP Service marketplace login required)
Key words : 
period split 'posting period', standard analysis / flexible analysis, fiscal year variant, set field periv, fiscal year variants, contact remote consulting, statistical data reorganization, year-dependent fyv, posting period, standard analysis
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods |