ABAP Select data from SAP table RFK00 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFK00 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 RFK00. 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 RFK00 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_RFK00 TYPE STANDARD TABLE OF RFK00,
      WA_RFK00 TYPE RFK00,
      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: <RFK00> TYPE RFK00.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFK00.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFK00
  INTO TABLE IT_RFK00.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFK00
*  INTO TABLE @DATA(IT_RFK002).
*--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_RFK00 INDEX 1 INTO DATA(WA_RFK002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFK00 ASSIGNING <RFK00>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFK00>-APPLK = 1.
<RFK00>-AUGBL = 1.
<RFK00>-OPBEL = 1.
<RFK00>-WHBUD = 1.
<RFK00>-BLART = 1.

ENDLOOP.

LOOP AT IT_RFK00 INTO WA_RFK00.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFK00-FIKEY, sy-vline,
  WA_RFK00-BUDAT, sy-vline,
  WA_RFK00-STODT, sy-vline,
  WA_RFK00-AUGRD, sy-vline,
  WA_RFK00-HERKF, sy-vline,
  WA_RFK00-STBLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFK00 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_RFK00 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_RFK00 INTO WA_RFK00.


*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 AUGBL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-AUGBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-AUGBL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-OPBEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STBLG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-STBLG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-STBLG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field XBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-XBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-XBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NRZAA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-NRZAA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-NRZAA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OPBEL_LS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-OPBEL_LS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-OPBEL_LS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STORB_LS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-STORB_LS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-STORB_LS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PYORD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-PYORD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-PYORD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PPKEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-PPKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-PPKEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PNNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFK00-PNNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFK00-PNNUM.
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_RFK00_STR, 
APPLK TYPE STRING,
AUGBL TYPE STRING,
OPBEL TYPE STRING,
WHBUD TYPE STRING,
BLART TYPE STRING,
FIKEY TYPE STRING,
BUDAT TYPE STRING,
STODT TYPE STRING,
AUGRD TYPE STRING,
HERKF TYPE STRING,
STBLG TYPE STRING,
TXT01 TYPE STRING,
TXT02 TYPE STRING,
XBLNR TYPE STRING,
NRZAA TYPE STRING,
XOFWH TYPE STRING,
XWHDA TYPE STRING,
OPBEL_LS TYPE STRING,
STORB_LS TYPE STRING,
TITLE TYPE STRING,
PYORD TYPE STRING,
XRAGS TYPE STRING,
XRATL TYPE STRING,
XRANP TYPE STRING,
XRANK TYPE STRING,
XRAVT TYPE STRING,
XRAX1 TYPE STRING,
XRAX2 TYPE STRING,
C4EYE TYPE STRING,
VOIDR TYPE STRING,
TXT50 TYPE STRING,
TXT50A TYPE STRING,
ADDFL TYPE STRING,
XERWS TYPE STRING,
GPART TYPE STRING,
PYGRP TYPE STRING,
KEYZ1 TYPE STRING,
POSZA TYPE STRING,
OPORD TYPE STRING,
STMET TYPE STRING,
XARCD TYPE STRING,
PPKEY TYPE STRING,
PNNUM TYPE STRING,
PNHKF TYPE STRING,
PNRVT TYPE STRING,
CHCKN TYPE STRING,
WNPER TYPE STRING,
XDIRTR TYPE STRING,
RVRSN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFK00_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_RFK00_STR-APPLK sy-vline 
WA_RFK00_STR-AUGBL sy-vline 
WA_RFK00_STR-OPBEL sy-vline 
WA_RFK00_STR-WHBUD sy-vline 
WA_RFK00_STR-BLART sy-vline 
WA_RFK00_STR-FIKEY sy-vline 
WA_RFK00_STR-BUDAT sy-vline 
WA_RFK00_STR-STODT sy-vline 
WA_RFK00_STR-AUGRD sy-vline 
WA_RFK00_STR-HERKF sy-vline 
WA_RFK00_STR-STBLG sy-vline 
WA_RFK00_STR-TXT01 sy-vline 
WA_RFK00_STR-TXT02 sy-vline 
WA_RFK00_STR-XBLNR sy-vline 
WA_RFK00_STR-NRZAA sy-vline 
WA_RFK00_STR-XOFWH sy-vline 
WA_RFK00_STR-XWHDA sy-vline 
WA_RFK00_STR-OPBEL_LS sy-vline 
WA_RFK00_STR-STORB_LS sy-vline 
WA_RFK00_STR-TITLE sy-vline 
WA_RFK00_STR-PYORD sy-vline 
WA_RFK00_STR-XRAGS sy-vline 
WA_RFK00_STR-XRATL sy-vline 
WA_RFK00_STR-XRANP sy-vline 
WA_RFK00_STR-XRANK sy-vline 
WA_RFK00_STR-XRAVT sy-vline 
WA_RFK00_STR-XRAX1 sy-vline 
WA_RFK00_STR-XRAX2 sy-vline 
WA_RFK00_STR-C4EYE sy-vline 
WA_RFK00_STR-VOIDR sy-vline 
WA_RFK00_STR-TXT50 sy-vline 
WA_RFK00_STR-TXT50A sy-vline 
WA_RFK00_STR-ADDFL sy-vline 
WA_RFK00_STR-XERWS sy-vline 
WA_RFK00_STR-GPART sy-vline 
WA_RFK00_STR-PYGRP sy-vline 
WA_RFK00_STR-KEYZ1 sy-vline 
WA_RFK00_STR-POSZA sy-vline 
WA_RFK00_STR-OPORD sy-vline 
WA_RFK00_STR-STMET sy-vline 
WA_RFK00_STR-XARCD sy-vline 
WA_RFK00_STR-PPKEY sy-vline 
WA_RFK00_STR-PNNUM sy-vline 
WA_RFK00_STR-PNHKF sy-vline 
WA_RFK00_STR-PNRVT sy-vline 
WA_RFK00_STR-CHCKN sy-vline 
WA_RFK00_STR-WNPER sy-vline 
WA_RFK00_STR-XDIRTR sy-vline 
WA_RFK00_STR-RVRSN sy-vline      INTO ld_text SEPARATED BY SPACE.

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