How to fetch data on selection screen dynamically .

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Method 1. Using F4 help

using this you will get data in different field created on selection screen  

*create selection screen*
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
SELECT-OPTIONS : p_reason  FOR zmm_reason-zzreasoncode NO INTERVALS NO-EXTENSION MODIF ID r1 .          "reason for reversalSELECT-OPTIONS : p_value  FOR zmm_reason-zzreason NO INTERVALS NO-EXTENSION MODIF ID r2.SELECTION-SCREEN END OF BLOCK b1.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_reason-low .
 PERFORM f4_help .
*&---------------------------------------------------------------------**&      Form  F4_help*&---------------------------------------------------------------------**       text*----------------------------------------------------------------------*FORM f4_help .  SELECT zzreasoncode zzreason FROM zmm_reason INTO TABLE gt_reason.
  CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'    EXPORTING      retfield    = 'ZZREASONCODE'      dynpprog    = sy-repid
      dynpnr      = sy-dynnr
      dynprofield = 'p_reason'      value_org   = 'S'    TABLES      value_tab   = gt_reason
      return_tab  = itab_selected.
  READ TABLE itab_selected INDEX 1  .  IF sy-subrc = 0 .    SELECT zzreasoncode zzreason FROM zmm_reason INTO TABLE gt_reason WHERE zzreasoncode = itab_selected-fieldval.    READ TABLE gt_reason INTO gs_reason WITH KEY zzreasoncode = itab_selected-fieldval.    MOVE gs_reason-zzreason TO p_value-low .
  ENDIF.
ENDFORM .                    "F4_help
image 1


image 2


 




as per image 2 on selecting 01 in reason for reversal you will get value 'Material Issue' in Description after you click ENTER .

METHOD 2 : GETTING THE VALUE IN PARALLEL . 

While creating screen use :

SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
SELECTION-SCREEN BEGIN OF LINE.
SELECT-OPTIONS : p_reason  FOR zmm_reason-zzreasoncode NO INTERVALS NO-EXTENSION MODIF ID r1 .          "reason for reversal
SELECT-OPTIONS : p_value  FOR zmm_reason-zzreason NO INTERVALS NO-EXTENSION MODIF ID r2.SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN END OF LINE.
rest code is same with this you can get the value in adjacent of your field .  :) 

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