ABAP Select data from SAP table RKATKLV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKATKLV 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 RKATKLV. 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 RKATKLV 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_RKATKLV TYPE STANDARD TABLE OF RKATKLV,
      WA_RKATKLV TYPE RKATKLV,
      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: <RKATKLV> TYPE RKATKLV.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKATKLV
  INTO TABLE IT_RKATKLV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKATKLV
*  INTO TABLE @DATA(IT_RKATKLV2).
*--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_RKATKLV INDEX 1 INTO DATA(WA_RKATKLV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKATKLV ASSIGNING <RKATKLV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKATKLV>-KOSTL = 1.
<RKATKLV>-KSKTXT = 1.
<RKATKLV>-LSTAR = 1.
<RKATKLV>-LAKTXT = 1.
<RKATKLV>-KWAER = 1.

ENDLOOP.

LOOP AT IT_RKATKLV INTO WA_RKATKLV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKATKLV-OWAER, sy-vline,
  WA_RKATKLV-TARKZ, sy-vline,
  WA_RKATKLV-WRTTP, sy-vline,
  WA_RKATKLV-TARVKZ, sy-vline,
  WA_RKATKLV-SELCRIT1, sy-vline,
  WA_RKATKLV-MEINH1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKATKLV 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_RKATKLV 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_RKATKLV INTO WA_RKATKLV.


*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 ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-KOSTL.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field MEINH1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-MEINH1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-MEINH1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKGMEAN1
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKGMEAN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKGMEAN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKVMEAN1
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKVMEAN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKVMEAN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKFMEAN1
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKFMEAN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKFMEAN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOGMEAN1
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOGMEAN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOGMEAN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOVMEAN1
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOVMEAN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOVMEAN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOFMEAN1
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOFMEAN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOFMEAN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINH2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-MEINH2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-MEINH2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKGMEAN2
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKGMEAN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKGMEAN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKVMEAN2
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKVMEAN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKVMEAN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKFMEAN2
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKFMEAN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKFMEAN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOGMEAN2
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOGMEAN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOGMEAN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOVMEAN2
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOVMEAN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOVMEAN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOFMEAN2
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOFMEAN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOFMEAN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKGVAR
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKGVAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKGVAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKVVAR
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKVVAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKVVAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKFVAR
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TKFVAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TKFVAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOGVAR
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOGVAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOGVAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOVVAR
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOVVAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOVVAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TOFVAR
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RKATKLV-TOFVAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKATKLV-TOFVAR.
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_RKATKLV_STR, 
KOSTL TYPE STRING,
KSKTXT TYPE STRING,
LSTAR TYPE STRING,
LAKTXT TYPE STRING,
KWAER TYPE STRING,
OWAER TYPE STRING,
TARKZ TYPE STRING,
WRTTP TYPE STRING,
TARVKZ TYPE STRING,
SELCRIT1 TYPE STRING,
MEINH1 TYPE STRING,
TKGMEAN1 TYPE STRING,
TKVMEAN1 TYPE STRING,
TKFMEAN1 TYPE STRING,
TOGMEAN1 TYPE STRING,
TOVMEAN1 TYPE STRING,
TOFMEAN1 TYPE STRING,
SELCRIT2 TYPE STRING,
MEINH2 TYPE STRING,
TKGMEAN2 TYPE STRING,
TKVMEAN2 TYPE STRING,
TKFMEAN2 TYPE STRING,
TOGMEAN2 TYPE STRING,
TOVMEAN2 TYPE STRING,
TOFMEAN2 TYPE STRING,
TKGVAR TYPE STRING,
TKVVAR TYPE STRING,
TKFVAR TYPE STRING,
TOGVAR TYPE STRING,
TOVVAR TYPE STRING,
TOFVAR TYPE STRING,
TKGVARPROZ TYPE STRING,
TKVVARPROZ TYPE STRING,
TKFVARPROZ TYPE STRING,
TOGVARPROZ TYPE STRING,
TOVVARPROZ TYPE STRING,
TOFVARPROZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKATKLV_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_RKATKLV_STR-KOSTL sy-vline 
WA_RKATKLV_STR-KSKTXT sy-vline 
WA_RKATKLV_STR-LSTAR sy-vline 
WA_RKATKLV_STR-LAKTXT sy-vline 
WA_RKATKLV_STR-KWAER sy-vline 
WA_RKATKLV_STR-OWAER sy-vline 
WA_RKATKLV_STR-TARKZ sy-vline 
WA_RKATKLV_STR-WRTTP sy-vline 
WA_RKATKLV_STR-TARVKZ sy-vline 
WA_RKATKLV_STR-SELCRIT1 sy-vline 
WA_RKATKLV_STR-MEINH1 sy-vline 
WA_RKATKLV_STR-TKGMEAN1 sy-vline 
WA_RKATKLV_STR-TKVMEAN1 sy-vline 
WA_RKATKLV_STR-TKFMEAN1 sy-vline 
WA_RKATKLV_STR-TOGMEAN1 sy-vline 
WA_RKATKLV_STR-TOVMEAN1 sy-vline 
WA_RKATKLV_STR-TOFMEAN1 sy-vline 
WA_RKATKLV_STR-SELCRIT2 sy-vline 
WA_RKATKLV_STR-MEINH2 sy-vline 
WA_RKATKLV_STR-TKGMEAN2 sy-vline 
WA_RKATKLV_STR-TKVMEAN2 sy-vline 
WA_RKATKLV_STR-TKFMEAN2 sy-vline 
WA_RKATKLV_STR-TOGMEAN2 sy-vline 
WA_RKATKLV_STR-TOVMEAN2 sy-vline 
WA_RKATKLV_STR-TOFMEAN2 sy-vline 
WA_RKATKLV_STR-TKGVAR sy-vline 
WA_RKATKLV_STR-TKVVAR sy-vline 
WA_RKATKLV_STR-TKFVAR sy-vline 
WA_RKATKLV_STR-TOGVAR sy-vline 
WA_RKATKLV_STR-TOVVAR sy-vline 
WA_RKATKLV_STR-TOFVAR sy-vline 
WA_RKATKLV_STR-TKGVARPROZ sy-vline 
WA_RKATKLV_STR-TKVVARPROZ sy-vline 
WA_RKATKLV_STR-TKFVARPROZ sy-vline 
WA_RKATKLV_STR-TOGVARPROZ sy-vline 
WA_RKATKLV_STR-TOVVARPROZ sy-vline 
WA_RKATKLV_STR-TOFVARPROZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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