Hi Aminie,
That Function Module returns the details of the Fiscal Year variant that is passed into it. For testing you can execute the FM with Value 'K4' in parameter I_PERIV that should return the details of 'K4' in E_T009 structure populating the following values:
Client
Fiscal Year Variant
Indicator: Determine periods like calendar year ?
Indicator: Fiscal year variants year-dependent ?
Number of posting periods
Number of special periods
Cheers,
Arindam