How to set two parameter value using one f4 help of 'F4IF_INT_TABLE_VALUE_REQUEST'

Question

I have two parameters on selection screen .
P_QTR and P_YEAR
I have concatenated the Quarter and Year Value to give same f4 on both paramatersto give f4 using 'F4IF_INT_TABLE_VALUE_REQUEST'
for example Q1 2014
now when user selects one value i want to set Q1 to P_QTR and 2014 to P_YEAR.
but it is setting only one value for P_QTR correctly and the value for P_year is not coming on screen although the value is thier inside code in P_year
i am using same f4 for both events
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_qtr.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_year.
here is the code i am using
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
      EXPORTING
        retfield        = 'CHAR20'
        window_title    = text-026
        value_org       = 'S'
      TABLES
        value_tab       = mt_input_f4
        return_tab      = mt_return
      EXCEPTIONS
        parameter_error = 1
        no_values_found = 2
        OTHERS          = 3.
    IF sy-subrc <> 0.
      CLEAR mt_input_f4[].
    ENDIF.
    READ TABLE mt_return INTO ms_return INDEX 1.
    IF sy-subrc EQ 0.
      p_qtr = ms_return-fieldval+0(2).
      p_year = ms_return-fieldval+3(4) .
    ENDIF.
plz chk  attached pics

Answer 1

i am sorry for delayed update but i fixed it using following approach.
    READ TABLE mt_return INTO ms_return INDEX 1.
    IF sy-subrc EQ 0.
      ls_dynpread-fieldname = 'P_QTR'.
      ls_dynpread-fieldvalue = ms_return-fieldval+0(2).
      APPEND ls_dynpread TO lt_dynpread.
      ls_dynpread-fieldname = 'P_YEAR'.
      ls_dynpread-fieldvalue = ms_return-fieldval+3(4).
      APPEND ls_dynpread TO lt_dynpread.
**setting the selection screen values
      CALL FUNCTION 'DYNP_VALUES_UPDATE'
        EXPORTING
          dyname               = sy-repid
          dynumb               = '1000'
        TABLES
          dynpfields           = lt_dynpread
        EXCEPTIONS
          invalid_abapworkarea = 1
          invalid_dynprofield  = 2
          invalid_dynproname   = 3
          invalid_dynpronummer = 4
          invalid_request      = 5
          no_fielddescription  = 6
          undefind_error       = 7
          OTHERS               = 8.
      IF sy-subrc <> 0.
        CLEAR lt_dynpread[].
      ENDIF.