ABAP Select data from SAP table RE20F into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RE20F 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 RE20F. 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 RE20F 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_RE20F TYPE STANDARD TABLE OF RE20F,
      WA_RE20F TYPE RE20F,
      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: <RE20F> TYPE RE20F.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RE20F.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RE20F
  INTO TABLE IT_RE20F.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RE20F
*  INTO TABLE @DATA(IT_RE20F2).
*--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_RE20F INDEX 1 INTO DATA(WA_RE20F2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RE20F ASSIGNING <RE20F>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RE20F>-MANDT = 1.
<RE20F>-SPRAS = 1.
<RE20F>-OPERAND = 1.
<RE20F>-SPARTE = 1.
<RE20F>-OPTYP = 1.

ENDLOOP.

LOOP AT IT_RE20F INTO WA_RE20F.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RE20F-MASS, sy-vline,
  WA_RE20F-ORGWERT, sy-vline,
  WA_RE20F-TAZUORD, sy-vline,
  WA_RE20F-RUNDUNG, sy-vline,
  WA_RE20F-RUNDART, sy-vline,
  WA_RE20F-TEXT30, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RE20F 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_RE20F 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_RE20F INTO WA_RE20F.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RE20F-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RE20F-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RE20F-MASS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RE20F-MASS.
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_RE20F_STR, 
MANDT TYPE STRING,
SPRAS TYPE STRING,
OPERAND TYPE STRING,
SPARTE TYPE STRING,
OPTYP TYPE STRING,
MASS TYPE STRING,
ORGWERT TYPE STRING,
TAZUORD TYPE STRING,
RUNDUNG TYPE STRING,
RUNDART TYPE STRING,
TEXT30 TYPE STRING,
LEISTALL TYPE STRING,
LEISTMONAT TYPE STRING,
BZGART TYPE STRING,
HISTSTEU TYPE STRING,
SPARTEXT TYPE STRING,
ABLESGRUP TYPE STRING,
GEWKEY TYPE STRING,
SELCONTROL TYPE STRING,
SEASONFLAG TYPE STRING,
PEAK_NO TYPE STRING,
FRAN_NO TYPE STRING,
FRAN_CUS TYPE STRING,
FRAN_COM TYPE STRING,
FRAN_TYPE TYPE STRING,
REG_OPERAND TYPE STRING,
DEMAND_AS_IS TYPE STRING,
ALLHISTORY TYPE STRING,
RTPOPERAND TYPE STRING,
USAGE_NORMAL TYPE STRING,
USAGE_REGOP TYPE STRING,
USAGE_HISTORY TYPE STRING,
USAGE_RTP TYPE STRING,
USAGE_CONDITION TYPE STRING,
USE_UDEFVAL1 TYPE STRING,
USE_UDEFVAL2 TYPE STRING,
USE_UDEFVAL3 TYPE STRING,
USE_UDEFVAL4 TYPE STRING,
OPGROUP TYPE STRING,
ACTFACTIND TYPE STRING,
NODIALOGINST TYPE STRING,
NODIALOGRCAT TYPE STRING,
NODIALOGRATE TYPE STRING,
REFVAL_STANDARD TYPE STRING,
REFVAL_LIGHTING TYPE STRING,
REFVAL_HEATING TYPE STRING,
REFVAL_CONTAINER TYPE STRING,
REFVAL_AREA TYPE STRING,
ROUND_UP TYPE STRING,
ROUND_DOWN TYPE STRING,
ROUND_KAUF TYPE STRING,
ROUND_NO TYPE STRING,
SELC_ALL TYPE STRING,
SELC_END_OF_RATE TYPE STRING,
SELC_KEY_DAY TYPE STRING,
SELC_END_OF_PERIOD TYPE STRING,
SELC_ALL_MONTHLY TYPE STRING,
SELC_BEGIN_OF_PERIOD TYPE STRING,
SELC_CUST_DATE TYPE STRING,
HIST_OPTYP TYPE STRING,
HIST_BEGABRPE TYPE STRING,
HIST_BEGNACH TYPE STRING,
HIST_NO TYPE STRING,
CONREL TYPE STRING,
WASTEREL TYPE STRING,
PRODREL TYPE STRING,
CONSTYPE TYPE STRING,
BWREL TYPE STRING,
PRORATE_DAILY TYPE STRING,
ERCHVREL TYPE STRING,
CONDIREL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RE20F_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_RE20F_STR-MANDT sy-vline 
WA_RE20F_STR-SPRAS sy-vline 
WA_RE20F_STR-OPERAND sy-vline 
WA_RE20F_STR-SPARTE sy-vline 
WA_RE20F_STR-OPTYP sy-vline 
WA_RE20F_STR-MASS sy-vline 
WA_RE20F_STR-ORGWERT sy-vline 
WA_RE20F_STR-TAZUORD sy-vline 
WA_RE20F_STR-RUNDUNG sy-vline 
WA_RE20F_STR-RUNDART sy-vline 
WA_RE20F_STR-TEXT30 sy-vline 
WA_RE20F_STR-LEISTALL sy-vline 
WA_RE20F_STR-LEISTMONAT sy-vline 
WA_RE20F_STR-BZGART sy-vline 
WA_RE20F_STR-HISTSTEU sy-vline 
WA_RE20F_STR-SPARTEXT sy-vline 
WA_RE20F_STR-ABLESGRUP sy-vline 
WA_RE20F_STR-GEWKEY sy-vline 
WA_RE20F_STR-SELCONTROL sy-vline 
WA_RE20F_STR-SEASONFLAG sy-vline 
WA_RE20F_STR-PEAK_NO sy-vline 
WA_RE20F_STR-FRAN_NO sy-vline 
WA_RE20F_STR-FRAN_CUS sy-vline 
WA_RE20F_STR-FRAN_COM sy-vline 
WA_RE20F_STR-FRAN_TYPE sy-vline 
WA_RE20F_STR-REG_OPERAND sy-vline 
WA_RE20F_STR-DEMAND_AS_IS sy-vline 
WA_RE20F_STR-ALLHISTORY sy-vline 
WA_RE20F_STR-RTPOPERAND sy-vline 
WA_RE20F_STR-USAGE_NORMAL sy-vline 
WA_RE20F_STR-USAGE_REGOP sy-vline 
WA_RE20F_STR-USAGE_HISTORY sy-vline 
WA_RE20F_STR-USAGE_RTP sy-vline 
WA_RE20F_STR-USAGE_CONDITION sy-vline 
WA_RE20F_STR-USE_UDEFVAL1 sy-vline 
WA_RE20F_STR-USE_UDEFVAL2 sy-vline 
WA_RE20F_STR-USE_UDEFVAL3 sy-vline 
WA_RE20F_STR-USE_UDEFVAL4 sy-vline 
WA_RE20F_STR-OPGROUP sy-vline 
WA_RE20F_STR-ACTFACTIND sy-vline 
WA_RE20F_STR-NODIALOGINST sy-vline 
WA_RE20F_STR-NODIALOGRCAT sy-vline 
WA_RE20F_STR-NODIALOGRATE sy-vline 
WA_RE20F_STR-REFVAL_STANDARD sy-vline 
WA_RE20F_STR-REFVAL_LIGHTING sy-vline 
WA_RE20F_STR-REFVAL_HEATING sy-vline 
WA_RE20F_STR-REFVAL_CONTAINER sy-vline 
WA_RE20F_STR-REFVAL_AREA sy-vline 
WA_RE20F_STR-ROUND_UP sy-vline 
WA_RE20F_STR-ROUND_DOWN sy-vline 
WA_RE20F_STR-ROUND_KAUF sy-vline 
WA_RE20F_STR-ROUND_NO sy-vline 
WA_RE20F_STR-SELC_ALL sy-vline 
WA_RE20F_STR-SELC_END_OF_RATE sy-vline 
WA_RE20F_STR-SELC_KEY_DAY sy-vline 
WA_RE20F_STR-SELC_END_OF_PERIOD sy-vline 
WA_RE20F_STR-SELC_ALL_MONTHLY sy-vline 
WA_RE20F_STR-SELC_BEGIN_OF_PERIOD sy-vline 
WA_RE20F_STR-SELC_CUST_DATE sy-vline 
WA_RE20F_STR-HIST_OPTYP sy-vline 
WA_RE20F_STR-HIST_BEGABRPE sy-vline 
WA_RE20F_STR-HIST_BEGNACH sy-vline 
WA_RE20F_STR-HIST_NO sy-vline 
WA_RE20F_STR-CONREL sy-vline 
WA_RE20F_STR-WASTEREL sy-vline 
WA_RE20F_STR-PRODREL sy-vline 
WA_RE20F_STR-CONSTYPE sy-vline 
WA_RE20F_STR-BWREL sy-vline 
WA_RE20F_STR-PRORATE_DAILY sy-vline 
WA_RE20F_STR-ERCHVREL sy-vline 
WA_RE20F_STR-CONDIREL sy-vline      INTO ld_text SEPARATED BY SPACE.

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