Solution : https://service.sap.com/sap/support/notes/1407784 (SAP Service marketplace login required)
Key words :
call transaction faglb03, general ledger account, display data related, fiscal year variant, shortened fiscal year, shortened year reason, relevant support package, created special periods, 12 'normal' periods, special period
Related Notes :
| 1041753 | FAGLB03: Special periods are not displayed correctly |
| 672255 | Shortened fiscal year/changing fiscal periods |