ABAP Select data from SAP table /KYK/ISS_ME4N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /KYK/ISS_ME4N table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to /KYK/ISS_ME4N. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the /KYK/ISS_ME4N table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_/KYK/ISS_ME4N TYPE STANDARD TABLE OF /KYK/ISS_ME4N,
      WA_/KYK/ISS_ME4N TYPE /KYK/ISS_ME4N,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: </KYK/ISS_ME4N> TYPE /KYK/ISS_ME4N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/KYK/ISS_ME4N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /KYK/ISS_ME4N
  INTO TABLE IT_/KYK/ISS_ME4N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /KYK/ISS_ME4N
*  INTO TABLE @DATA(IT_/KYK/ISS_ME4N2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_/KYK/ISS_ME4N INDEX 1 INTO DATA(WA_/KYK/ISS_ME4N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/KYK/ISS_ME4N ASSIGNING </KYK/ISS_ME4N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</KYK/ISS_ME4N>-BNFPO = 1.
</KYK/ISS_ME4N>-STATU = 1.
</KYK/ISS_ME4N>-LOEKZ = 1.
</KYK/ISS_ME4N>-FRGKZ = 1.
</KYK/ISS_ME4N>-MATNR = 1.

ENDLOOP.

LOOP AT IT_/KYK/ISS_ME4N INTO WA_/KYK/ISS_ME4N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/KYK/ISS_ME4N-BSART, sy-vline,
  WA_/KYK/ISS_ME4N-TXZ01, sy-vline,
  WA_/KYK/ISS_ME4N-MENGE, sy-vline,
  WA_/KYK/ISS_ME4N-MEINS, sy-vline,
  WA_/KYK/ISS_ME4N-EEIND, sy-vline,
  WA_/KYK/ISS_ME4N-WERKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/KYK/ISS_ME4N you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_/KYK/ISS_ME4N TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_/KYK/ISS_ME4N INTO WA_/KYK/ISS_ME4N.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KONNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-KONNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-KONNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-INFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-INFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-BMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-BMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EMLIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-EMLIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-EMLIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BANFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/KYK/ISS_ME4N-BANFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KYK/ISS_ME4N-BANFN.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/KYK/ISS_ME4N_STR, 
BNFPO TYPE STRING,
STATU TYPE STRING,
LOEKZ TYPE STRING,
FRGKZ TYPE STRING,
MATNR TYPE STRING,
BSART TYPE STRING,
TXZ01 TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
EEIND TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
ESTKZ TYPE STRING,
EKGRP TYPE STRING,
AFNAM TYPE STRING,
RESWK TYPE STRING,
EKORG TYPE STRING,
KONNR TYPE STRING,
BUMNG TYPE STRING,
INFNR TYPE STRING,
N_REQS TYPE STRING,
EBELN TYPE STRING,
BEDAT TYPE STRING,
BSMNG TYPE STRING,
FRGST TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
BADAT TYPE STRING,
PREIS TYPE STRING,
PEINH TYPE STRING,
BWTAR TYPE STRING,
EBAKZ TYPE STRING,
RSNUM TYPE STRING,
SOBKZ TYPE STRING,
BMEIN TYPE STRING,
FRGGR TYPE STRING,
CHARG TYPE STRING,
ATTYP TYPE STRING,
EMLIF TYPE STRING,
GSWRT TYPE STRING,
WAERS TYPE STRING,
BANFN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/KYK/ISS_ME4N_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_/KYK/ISS_ME4N_STR-BNFPO sy-vline 
WA_/KYK/ISS_ME4N_STR-STATU sy-vline 
WA_/KYK/ISS_ME4N_STR-LOEKZ sy-vline 
WA_/KYK/ISS_ME4N_STR-FRGKZ sy-vline 
WA_/KYK/ISS_ME4N_STR-MATNR sy-vline 
WA_/KYK/ISS_ME4N_STR-BSART sy-vline 
WA_/KYK/ISS_ME4N_STR-TXZ01 sy-vline 
WA_/KYK/ISS_ME4N_STR-MENGE sy-vline 
WA_/KYK/ISS_ME4N_STR-MEINS sy-vline 
WA_/KYK/ISS_ME4N_STR-EEIND sy-vline 
WA_/KYK/ISS_ME4N_STR-WERKS sy-vline 
WA_/KYK/ISS_ME4N_STR-LGORT sy-vline 
WA_/KYK/ISS_ME4N_STR-ESTKZ sy-vline 
WA_/KYK/ISS_ME4N_STR-EKGRP sy-vline 
WA_/KYK/ISS_ME4N_STR-AFNAM sy-vline 
WA_/KYK/ISS_ME4N_STR-RESWK sy-vline 
WA_/KYK/ISS_ME4N_STR-EKORG sy-vline 
WA_/KYK/ISS_ME4N_STR-KONNR sy-vline 
WA_/KYK/ISS_ME4N_STR-BUMNG sy-vline 
WA_/KYK/ISS_ME4N_STR-INFNR sy-vline 
WA_/KYK/ISS_ME4N_STR-N_REQS sy-vline 
WA_/KYK/ISS_ME4N_STR-EBELN sy-vline 
WA_/KYK/ISS_ME4N_STR-BEDAT sy-vline 
WA_/KYK/ISS_ME4N_STR-BSMNG sy-vline 
WA_/KYK/ISS_ME4N_STR-FRGST sy-vline 
WA_/KYK/ISS_ME4N_STR-ERNAM sy-vline 
WA_/KYK/ISS_ME4N_STR-ERDAT sy-vline 
WA_/KYK/ISS_ME4N_STR-BADAT sy-vline 
WA_/KYK/ISS_ME4N_STR-PREIS sy-vline 
WA_/KYK/ISS_ME4N_STR-PEINH sy-vline 
WA_/KYK/ISS_ME4N_STR-BWTAR sy-vline 
WA_/KYK/ISS_ME4N_STR-EBAKZ sy-vline 
WA_/KYK/ISS_ME4N_STR-RSNUM sy-vline 
WA_/KYK/ISS_ME4N_STR-SOBKZ sy-vline 
WA_/KYK/ISS_ME4N_STR-BMEIN sy-vline 
WA_/KYK/ISS_ME4N_STR-FRGGR sy-vline 
WA_/KYK/ISS_ME4N_STR-CHARG sy-vline 
WA_/KYK/ISS_ME4N_STR-ATTYP sy-vline 
WA_/KYK/ISS_ME4N_STR-EMLIF sy-vline 
WA_/KYK/ISS_ME4N_STR-GSWRT sy-vline 
WA_/KYK/ISS_ME4N_STR-WAERS sy-vline 
WA_/KYK/ISS_ME4N_STR-BANFN sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.