Solution : https://service.sap.com/sap/support/notes/169808 (SAP Service marketplace login required)
Key words : 
shortened fiscal year, normal fiscal year, additional key words, attached program correction, program error, entered periods, mistake checked, termsplanning processor, solution implement, t009yprogramsrkccapln
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods |