Solution : https://service.sap.com/sap/support/notes/779166 (SAP Service marketplace login required)
Key words : 
system generates error message gu506, shortened fiscal year reason, shortened fiscal year, fiscal year variant, fiscal year, program error, current year, currency translation, posting period, terms ficumr00
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods |