ABAP Select data from SAP table RFKU1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKU1 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 RFKU1. 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 RFKU1 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_RFKU1 TYPE STANDARD TABLE OF RFKU1,
      WA_RFKU1 TYPE RFKU1,
      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: <RFKU1> TYPE RFKU1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKU1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKU1
  INTO TABLE IT_RFKU1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKU1
*  INTO TABLE @DATA(IT_RFKU12).
*--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_RFKU1 INDEX 1 INTO DATA(WA_RFKU12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKU1 ASSIGNING <RFKU1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKU1>-APPLK = 1.
<RFKU1>-GPART_ORI = 1.
<RFKU1>-VKONT_ORI = 1.
<RFKU1>-VTREF_ORI = 1.
<RFKU1>-VTPOS_ORI = 1.

ENDLOOP.

LOOP AT IT_RFKU1 INTO WA_RFKU1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKU1-SUBAP_ORI, sy-vline,
  WA_RFKU1-VTRE2_ORI, sy-vline,
  WA_RFKU1-OPBEL_ORI, sy-vline,
  WA_RFKU1-XBLNR_ORI, sy-vline,
  WA_RFKU1-GPART_NEW, sy-vline,
  WA_RFKU1-VKONT_NEW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKU1 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_RFKU1 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_RFKU1 INTO WA_RFKU1.


*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 GPART_ORI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-GPART_ORI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-GPART_ORI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONT_ORI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-VKONT_ORI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-VKONT_ORI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTREF_ORI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-VTREF_ORI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-VTREF_ORI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTRE2_ORI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-VTRE2_ORI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-VTRE2_ORI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OPBEL_ORI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-OPBEL_ORI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-OPBEL_ORI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field XBLNR_ORI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-XBLNR_ORI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-XBLNR_ORI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART_NEW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-GPART_NEW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-GPART_NEW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONT_NEW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-VKONT_NEW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-VKONT_NEW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTREF_NEW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-VTREF_NEW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-VTREF_NEW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTRE2_NEW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-VTRE2_NEW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-VTRE2_NEW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALTBROK_NEW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-ALTBROK_NEW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-ALTBROK_NEW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALTBRCO_NEW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKU1-ALTBRCO_NEW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKU1-ALTBRCO_NEW.
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_RFKU1_STR, 
APPLK TYPE STRING,
GPART_ORI TYPE STRING,
VKONT_ORI TYPE STRING,
VTREF_ORI TYPE STRING,
VTPOS_ORI TYPE STRING,
SUBAP_ORI TYPE STRING,
VTRE2_ORI TYPE STRING,
OPBEL_ORI TYPE STRING,
XBLNR_ORI TYPE STRING,
GPART_NEW TYPE STRING,
VKONT_NEW TYPE STRING,
VTREF_NEW TYPE STRING,
VTPOS_NEW TYPE STRING,
SUBAP_NEW TYPE STRING,
VTRE2_NEW TYPE STRING,
BUKRS_NEW TYPE STRING,
GSBER_NEW TYPE STRING,
HERKF TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
BLART TYPE STRING,
FIKEY TYPE STRING,
AUGRD TYPE STRING,
UMGRD TYPE STRING,
WAERS TYPE STRING,
TXTGP_ORI TYPE STRING,
TXTVK_ORI TYPE STRING,
TXTVT_ORI TYPE STRING,
TXTOP_ORI TYPE STRING,
TXTGP_NEW TYPE STRING,
TXTVK_NEW TYPE STRING,
TXTVT_NEW TYPE STRING,
TXT01 TYPE STRING,
TXT02 TYPE STRING,
TXT03 TYPE STRING,
TXT04 TYPE STRING,
XALLI TYPE STRING,
XUMBH TYPE STRING,
XMHNU TYPE STRING,
ITRAN TYPE STRING,
ALTBROK_NEW TYPE STRING,
ALTBRCO_NEW TYPE STRING,
OPTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKU1_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_RFKU1_STR-APPLK sy-vline 
WA_RFKU1_STR-GPART_ORI sy-vline 
WA_RFKU1_STR-VKONT_ORI sy-vline 
WA_RFKU1_STR-VTREF_ORI sy-vline 
WA_RFKU1_STR-VTPOS_ORI sy-vline 
WA_RFKU1_STR-SUBAP_ORI sy-vline 
WA_RFKU1_STR-VTRE2_ORI sy-vline 
WA_RFKU1_STR-OPBEL_ORI sy-vline 
WA_RFKU1_STR-XBLNR_ORI sy-vline 
WA_RFKU1_STR-GPART_NEW sy-vline 
WA_RFKU1_STR-VKONT_NEW sy-vline 
WA_RFKU1_STR-VTREF_NEW sy-vline 
WA_RFKU1_STR-VTPOS_NEW sy-vline 
WA_RFKU1_STR-SUBAP_NEW sy-vline 
WA_RFKU1_STR-VTRE2_NEW sy-vline 
WA_RFKU1_STR-BUKRS_NEW sy-vline 
WA_RFKU1_STR-GSBER_NEW sy-vline 
WA_RFKU1_STR-HERKF sy-vline 
WA_RFKU1_STR-BUDAT sy-vline 
WA_RFKU1_STR-BLDAT sy-vline 
WA_RFKU1_STR-BLART sy-vline 
WA_RFKU1_STR-FIKEY sy-vline 
WA_RFKU1_STR-AUGRD sy-vline 
WA_RFKU1_STR-UMGRD sy-vline 
WA_RFKU1_STR-WAERS sy-vline 
WA_RFKU1_STR-TXTGP_ORI sy-vline 
WA_RFKU1_STR-TXTVK_ORI sy-vline 
WA_RFKU1_STR-TXTVT_ORI sy-vline 
WA_RFKU1_STR-TXTOP_ORI sy-vline 
WA_RFKU1_STR-TXTGP_NEW sy-vline 
WA_RFKU1_STR-TXTVK_NEW sy-vline 
WA_RFKU1_STR-TXTVT_NEW sy-vline 
WA_RFKU1_STR-TXT01 sy-vline 
WA_RFKU1_STR-TXT02 sy-vline 
WA_RFKU1_STR-TXT03 sy-vline 
WA_RFKU1_STR-TXT04 sy-vline 
WA_RFKU1_STR-XALLI sy-vline 
WA_RFKU1_STR-XUMBH sy-vline 
WA_RFKU1_STR-XMHNU sy-vline 
WA_RFKU1_STR-ITRAN sy-vline 
WA_RFKU1_STR-ALTBROK_NEW sy-vline 
WA_RFKU1_STR-ALTBRCO_NEW sy-vline 
WA_RFKU1_STR-OPTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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