Solution : https://service.sap.com/sap/support/notes/216776 (SAP Service marketplace login required)
Key words : 
table t009y 'shortened fiscal years, additional key words fiincon, 'edit -> shortened fisc, shortened fiscal year, local currency changeover, report rfewa011 selects, red traffic light, affected company code, asset accounting' implies, previous fiscal year
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods |