Solution : https://service.sap.com/sap/support/notes/359815 (SAP Service marketplace login required)
Summary : 
      This SAP Note addresses an issue where using transactions during a special period in different applications leads to an erroneous error message FGV002 stating 'Fiscal year variant &1 is not maintained for calendar year &2'. This typically occurs if the fiscal year in question is a shortened one. The resolution involves applying provided program corrections, which should resolve the error, allowing transactions to proceed smoothly without the system generating an error message.
Key words : 
incorrectly issue error message fgv002 'fiscal year variant &1, additional key words shortened year, shortened fiscal year, affected fiscal year, error message, attached program corrections, calendar year &2', special period, solution implement, system issuing
Related Notes : 
       
| 672255 | Shortened fiscal year/changing fiscal periods |