Try this,
wa_rsparams-selname = 'CN_PROJN'.
wa_rsparams-kind = 'S'.
wa_rsparams-sign = 'I'.
wa_rsparams-option = 'BT'.
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
EXPORTING
input = psphi_low
IMPORTING
output = wa_rsparams-low.
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
EXPORTING
input = psphi_high
IMPORTING
output = wa_rsparams-high.
APPEND wa_rsparams TO it_rsparams.
CLEAR wa_rsparams.
wa_rsparams-selname = 'R_BUDAT'.
wa_rsparams-kind = 'S'.
wa_rsparams-sign = 'I'.
wa_rsparams-option = 'BT'.
wa_rsparams-low = ' ' ."s_psphi-low.
wa_rsparams-high = sy-datum.
APPEND wa_rsparams TO it_rsparams.
CLEAR wa_rsparams.
cl_salv_bs_runtime_info=>set(
EXPORTING display = abap_false
metadata = abap_false
data = abap_true ).
SET PARAMETER ID 'CAC' FIELD kokrs."'BCCA'. """ added by prashant
SET PARAMETER ID 'PDB' FIELD prof_db."'000000000001'.
SUBMIT rkpep003 WITH SELECTION-TABLE it_rsparams AND RETURN.
TRY.
cl_salv_bs_runtime_info=>get_data_ref(
IMPORTING
r_data_descr = data_desc ).
* CATCH cx_salv_bs_sc_runtime_info.
ENDTRY.
IF data_desc IS NOT INITIAL.
TRY.
CREATE DATA data_handle TYPE HANDLE data_desc.
ASSIGN data_handle->* TO <it_tab>.
cl_salv_bs_runtime_info=>get_data(
IMPORTING
t_data = <it_tab> ).
* CATCH cx_salv_bs_sc_runtime_info.
ENDTRY.
cl_salv_bs_runtime_info=>clear_all( ).
ENDIF.
You can finally found your alv data in <it_tab> table.