ABAP Select data from SAP table RFKA1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKA1 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 RFKA1. 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 RFKA1 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_RFKA1 TYPE STANDARD TABLE OF RFKA1,
      WA_RFKA1 TYPE RFKA1,
      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: <RFKA1> TYPE RFKA1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKA1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKA1
  INTO TABLE IT_RFKA1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKA1
*  INTO TABLE @DATA(IT_RFKA12).
*--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_RFKA1 INDEX 1 INTO DATA(WA_RFKA12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKA1 ASSIGNING <RFKA1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKA1>-APPLK = 1.
<RFKA1>-BUKRS = 1.
<RFKA1>-COKEY = 1.
<RFKA1>-OPBEL = 1.
<RFKA1>-XBLNR = 1.

ENDLOOP.

LOOP AT IT_RFKA1 INTO WA_RFKA1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKA1-GPART, sy-vline,
  WA_RFKA1-VKONT, sy-vline,
  WA_RFKA1-VTREF, sy-vline,
  WA_RFKA1-SUBAP, sy-vline,
  WA_RFKA1-OPORD, sy-vline,
  WA_RFKA1-PREBE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKA1 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_RFKA1 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_RFKA1 INTO WA_RFKA1.


*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 OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1-OPBEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field XBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1-XBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1-XBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1-VKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1-VKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTREF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1-VTREF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1-VTREF.
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_RFKA1_STR, 
APPLK TYPE STRING,
BUKRS TYPE STRING,
COKEY TYPE STRING,
OPBEL TYPE STRING,
XBLNR TYPE STRING,
GPART TYPE STRING,
VKONT TYPE STRING,
VTREF TYPE STRING,
SUBAP TYPE STRING,
OPORD TYPE STRING,
PREBE TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
BLART TYPE STRING,
FIKEY TYPE STRING,
AUGRD TYPE STRING,
HERKF TYPE STRING,
ABGRD TYPE STRING,
WAERS TYPE STRING,
XRULE TYPE STRING,
XCOLL TYPE STRING,
XCOAC TYPE STRING,
XFMAC TYPE STRING,
XINH TYPE STRING,
TXTGP TYPE STRING,
TXTVK TYPE STRING,
TXTVT TYPE STRING,
TXT01 TYPE STRING,
TXT02 TYPE STRING,
TXT03 TYPE STRING,
TXT04 TYPE STRING,
TXT05 TYPE STRING,
TXT06 TYPE STRING,
XTAXA TYPE STRING,
XTAXT TYPE STRING,
GPDAT TYPE STRING,
MWSKZ TYPE STRING,
VERWD TYPE STRING,
XANZA TYPE STRING,
ABGRD_INV TYPE STRING,
BETRW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKA1_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_RFKA1_STR-APPLK sy-vline 
WA_RFKA1_STR-BUKRS sy-vline 
WA_RFKA1_STR-COKEY sy-vline 
WA_RFKA1_STR-OPBEL sy-vline 
WA_RFKA1_STR-XBLNR sy-vline 
WA_RFKA1_STR-GPART sy-vline 
WA_RFKA1_STR-VKONT sy-vline 
WA_RFKA1_STR-VTREF sy-vline 
WA_RFKA1_STR-SUBAP sy-vline 
WA_RFKA1_STR-OPORD sy-vline 
WA_RFKA1_STR-PREBE sy-vline 
WA_RFKA1_STR-BUDAT sy-vline 
WA_RFKA1_STR-BLDAT sy-vline 
WA_RFKA1_STR-BLART sy-vline 
WA_RFKA1_STR-FIKEY sy-vline 
WA_RFKA1_STR-AUGRD sy-vline 
WA_RFKA1_STR-HERKF sy-vline 
WA_RFKA1_STR-ABGRD sy-vline 
WA_RFKA1_STR-WAERS sy-vline 
WA_RFKA1_STR-XRULE sy-vline 
WA_RFKA1_STR-XCOLL sy-vline 
WA_RFKA1_STR-XCOAC sy-vline 
WA_RFKA1_STR-XFMAC sy-vline 
WA_RFKA1_STR-XINH sy-vline 
WA_RFKA1_STR-TXTGP sy-vline 
WA_RFKA1_STR-TXTVK sy-vline 
WA_RFKA1_STR-TXTVT sy-vline 
WA_RFKA1_STR-TXT01 sy-vline 
WA_RFKA1_STR-TXT02 sy-vline 
WA_RFKA1_STR-TXT03 sy-vline 
WA_RFKA1_STR-TXT04 sy-vline 
WA_RFKA1_STR-TXT05 sy-vline 
WA_RFKA1_STR-TXT06 sy-vline 
WA_RFKA1_STR-XTAXA sy-vline 
WA_RFKA1_STR-XTAXT sy-vline 
WA_RFKA1_STR-GPDAT sy-vline 
WA_RFKA1_STR-MWSKZ sy-vline 
WA_RFKA1_STR-VERWD sy-vline 
WA_RFKA1_STR-XANZA sy-vline 
WA_RFKA1_STR-ABGRD_INV sy-vline 
WA_RFKA1_STR-BETRW sy-vline      INTO ld_text SEPARATED BY SPACE.

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