Hi,
Please use the function module DATE_TO_PERIOD_CONVERT and use I_PERIV = K4. Concatenate E_GJAHR and E_BUPER without any dot. Store the output to a local variable of type numc 7.
If the result field is of type 0FISCPER, then system will convert the data and display with dot.
If you store RESULT = 2013001, then it will be displayed as 001.2013 automatically if you use info object 0FISCPER.
Hope this helps.
Regards
Sourav