Solution : https://service.sap.com/sap/support/notes/1081700 (SAP Service marketplace login required)
Key words : 
month day period   year shift01    09  12      -102    08  1       003    08  2       004    07  3       005    06  4       006    04  5       007    03  6       008    02  7       008    31  8       009    30  9       010    29  10      011    28  11      012    28  12      012    31   1      +1note, financial year variant periods & incomplete, system works internally, -gregorian date display, error message fgv 329, gregorian date format, hijra year 1429, calendar year, period-ends, maintain periods
Related Notes : 
       
| 1375438 | Globalization Collection Note | 
| 1073253 | OB29 and date formats | 
| 672255 | Shortened fiscal year/changing fiscal periods | 
| 10945 | F4554: Entry for 12/31 is missing |