Retrieve "Start date of Next financial Period" and "Current Period"

Hi,

T-code: cne5

I would like to display 2 new fields in cne5 report result:-

1) Start date of Next financial Period

2) Current Period

I can used

CALL FUNCTION 'DATE_TO_PERIOD_CONVERT'
     EXPORTING
          I_DATE         = SY-DATUM
          I_PERIV        = 'K4'

But what is I_PERIV ?

How can I retrieve the above fields value? Any Function Module that I can used?

Appreciate helps!

THanks a lot.