Use of DYNP_VALUES_READ and subsequently DYNP_VALUES_UPDATE

Question

Dear Exüerts:
I have a database table: Zlt_mita with fields M1 (Employee Name) and M2 (Employee Code).
Like:         M1                          M2
         Chandan Kumar        DAS0907
          Petra Sutor.               DAS0906   
ANd so on.....
Requirement: in the selection output screen I want to type the employee  name M! in one parameter P_mita say  then  corresponding employee code (M2) should get populate in the the other parameter box P_mitarn.
Here is my code. Please suggest me as how should I make it work:
DATA: it_zlt_mita TYPE TABLE OF ZLT_mita.
Selection-Screen: Begin of Block b1 With Frame Title text-001.
parameters:
  p_mitar              type Zlt_mita-M1,
  p_mitarn             type Zlt_mita-M2.
Selection-Screen : End of Block b1.
At SELECTION-SCREEN ON VALUE-REQUEST FOR P_mitarn.
Data: dynfields type table of dynpread with header line.
      dynfields-fieldname = 'p_mitar'.
      Append dynfields.
CALL FUNCTION 'DYNP_VALUES_READ'
  EXPORTING
    dyname                               = sy-cprog
    dynumb                               = sy-dynnr
*   TRANSLATE_TO_UPPER                   = ' '
*   REQUEST                              = ' '
*   PERFORM_CONVERSION_EXITS             = ' '
*   PERFORM_INPUT_CONVERSION             = ' '
*   DETERMINE_LOOP_INDEX                 = ' '
*   START_SEARCH_IN_CURRENT_SCREEN       = ' '
*   START_SEARCH_IN_MAIN_SCREEN          = ' '
*   START_SEARCH_IN_STACKED_SCREEN       = ' '
*   START_SEARCH_ON_SCR_STACKPOS         = ' '
*   SEARCH_OWN_SUBSCREENS_FIRST          = ' '
*   SEARCHPATH_OF_SUBSCREEN_AREAS        = ' '
  tables
    dynpfields                           =  dynfields
* EXCEPTIONS
*   INVALID_ABAPWORKAREA                 = 1
*   INVALID_DYNPROFIELD                  = 2
*   INVALID_DYNPRONAME                   = 3
*   INVALID_DYNPRONUMMER                 = 4
*   INVALID_REQUEST                      = 5
*   NO_FIELDDESCRIPTION                  = 6
*   INVALID_PARAMETER                    = 7
*   UNDEFIND_ERROR                       = 8
*   DOUBLE_CONVERSION                    = 9
*   STEPL_NOT_FOUND                      = 10
*   OTHERS                               = 11
IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Read Table dynfields with key fieldname = 'P_mitar'.
p_mitar  =   dynfields-fieldvalue.
AT SELECTION-SCREEN Output.
Data: dynfields1 type table of dynpread with header line.
      dynfields1-fieldname = 'p_mitarn'.
      Append dynfields1.
CALL FUNCTION 'DYNP_VALUES_UPDATE'
  EXPORTING
    dyname                     = sy-cprog
    dynumb                     = sy-dynnr
  tables
    dynpfields                 = dynfields1
* 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.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Looking forward for advise from you experts.
regards
chandan

Answer 1

Please refer to the thread below to update multiple fields by just pressing  F4 on one  field
F4 Search Help to select more than one column value
Other option is -
1) Assign search help on field level instead of data element for the fields to be displayed on the program's selection screen.
There is a standard SAP transaction dealing with challan numbers ( one of these transaction - J1INMIS /J1INBANK/ J1INCERT ). In that transaction, there are multiple fields on the selection screen. But you will observe that if you fill one field on the selection screen, other fields are automatically populated. This is because while designing, SAP realized that most of the times all these fields will be accessed together. So what SAP did was  i) created a table say 'ABC' . ii) Created a search help, assigned the table 'ABC'  as selection method and added the relevant fields.  iii) Then in the table 'ABC', assigned the search help at field level ( not data element level )  for all those fields.