ABAP Select data from SAP table RKMA1 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 RKMA1 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 RKMA1. 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 RKMA1 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_RKMA1 TYPE STANDARD TABLE OF RKMA1,
      WA_RKMA1 TYPE RKMA1,
      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: <RKMA1> TYPE RKMA1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKMA1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKMA1
  INTO TABLE IT_RKMA1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKMA1
*  INTO TABLE @DATA(IT_RKMA12).
*--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_RKMA1 INDEX 1 INTO DATA(WA_RKMA12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKMA1 ASSIGNING <RKMA1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKMA1>-KOKRS = 1.
<RKMA1>-AKOST = 1.
<RKMA1>-BKOST = 1.
<RKMA1>-RKOST = 1.
<RKMA1>-REKRS = 1.

ENDLOOP.

LOOP AT IT_RKMA1 INTO WA_RKMA1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKMA1-STEXT, sy-vline,
  WA_RKMA1-SPTXT, sy-vline,
  WA_RKMA1-SPTX1, sy-vline,
  WA_RKMA1-SPRAS, sy-vline,
  WA_RKMA1-ASPRA, sy-vline,
  WA_RKMA1-PSPRA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKMA1 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_RKMA1 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_RKMA1 INTO WA_RKMA1.


*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 AKOST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-AKOST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-AKOST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BKOST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-BKOST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-BKOST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RKOST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-RKOST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-RKOST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field ASPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-ASPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-ASPRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field PSPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-PSPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-PSPRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OBIDN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-OBIDN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-OBIDN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA1-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA1-KOSTL.
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_RKMA1_STR, 
KOKRS TYPE STRING,
AKOST TYPE STRING,
BKOST TYPE STRING,
RKOST TYPE STRING,
REKRS TYPE STRING,
STEXT TYPE STRING,
SPTXT TYPE STRING,
SPTX1 TYPE STRING,
SPRAS TYPE STRING,
ASPRA TYPE STRING,
PSPRA TYPE STRING,
TXTKA TYPE STRING,
TXTLA TYPE STRING,
BEZ1A TYPE STRING,
BEZ2A TYPE STRING,
BEZ3A TYPE STRING,
BEZ4A TYPE STRING,
TXTKP TYPE STRING,
TXTLP TYPE STRING,
BEZ1P TYPE STRING,
BEZ2P TYPE STRING,
BEZ3P TYPE STRING,
BEZ4P TYPE STRING,
GADAT TYPE STRING,
GBDAT TYPE STRING,
AEDAT TYPE STRING,
AESTD TYPE STRING,
ASTRF TYPE STRING,
TTXT1 TYPE STRING,
HBDAT TYPE STRING,
HADAT TYPE STRING,
FNAME TYPE STRING,
OBBEZ TYPE STRING,
OBKRS TYPE STRING,
OBIDN TYPE STRING,
OBADT TYPE STRING,
OBBDT TYPE STRING,
OBTXT TYPE STRING,
OBTYP TYPE STRING,
OBVER TYPE STRING,
OBCFD TYPE STRING,
OBNFD TYPE STRING,
OBDFD TYPE STRING,
LSTAT TYPE STRING,
CPCFD TYPE STRING,
CPNFD TYPE STRING,
CPDFD TYPE STRING,
ACPGE TYPE STRING,
NMPGE TYPE STRING,
TABNA TYPE STRING,
GJAHR TYPE STRING,
NEWAB TYPE STRING,
NEWBI TYPE STRING,
TXFLG TYPE STRING,
KHINR TYPE STRING,
HITXT TYPE STRING,
BUKRS TYPE STRING,
KTEXT TYPE STRING,
KOSTL TYPE STRING,
GSBER TYPE STRING,
PMARK TYPE STRING,
POSNR TYPE STRING,
BUTXT TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKMA1_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_RKMA1_STR-KOKRS sy-vline 
WA_RKMA1_STR-AKOST sy-vline 
WA_RKMA1_STR-BKOST sy-vline 
WA_RKMA1_STR-RKOST sy-vline 
WA_RKMA1_STR-REKRS sy-vline 
WA_RKMA1_STR-STEXT sy-vline 
WA_RKMA1_STR-SPTXT sy-vline 
WA_RKMA1_STR-SPTX1 sy-vline 
WA_RKMA1_STR-SPRAS sy-vline 
WA_RKMA1_STR-ASPRA sy-vline 
WA_RKMA1_STR-PSPRA sy-vline 
WA_RKMA1_STR-TXTKA sy-vline 
WA_RKMA1_STR-TXTLA sy-vline 
WA_RKMA1_STR-BEZ1A sy-vline 
WA_RKMA1_STR-BEZ2A sy-vline 
WA_RKMA1_STR-BEZ3A sy-vline 
WA_RKMA1_STR-BEZ4A sy-vline 
WA_RKMA1_STR-TXTKP sy-vline 
WA_RKMA1_STR-TXTLP sy-vline 
WA_RKMA1_STR-BEZ1P sy-vline 
WA_RKMA1_STR-BEZ2P sy-vline 
WA_RKMA1_STR-BEZ3P sy-vline 
WA_RKMA1_STR-BEZ4P sy-vline 
WA_RKMA1_STR-GADAT sy-vline 
WA_RKMA1_STR-GBDAT sy-vline 
WA_RKMA1_STR-AEDAT sy-vline 
WA_RKMA1_STR-AESTD sy-vline 
WA_RKMA1_STR-ASTRF sy-vline 
WA_RKMA1_STR-TTXT1 sy-vline 
WA_RKMA1_STR-HBDAT sy-vline 
WA_RKMA1_STR-HADAT sy-vline 
WA_RKMA1_STR-FNAME sy-vline 
WA_RKMA1_STR-OBBEZ sy-vline 
WA_RKMA1_STR-OBKRS sy-vline 
WA_RKMA1_STR-OBIDN sy-vline 
WA_RKMA1_STR-OBADT sy-vline 
WA_RKMA1_STR-OBBDT sy-vline 
WA_RKMA1_STR-OBTXT sy-vline 
WA_RKMA1_STR-OBTYP sy-vline 
WA_RKMA1_STR-OBVER sy-vline 
WA_RKMA1_STR-OBCFD sy-vline 
WA_RKMA1_STR-OBNFD sy-vline 
WA_RKMA1_STR-OBDFD sy-vline 
WA_RKMA1_STR-LSTAT sy-vline 
WA_RKMA1_STR-CPCFD sy-vline 
WA_RKMA1_STR-CPNFD sy-vline 
WA_RKMA1_STR-CPDFD sy-vline 
WA_RKMA1_STR-ACPGE sy-vline 
WA_RKMA1_STR-NMPGE sy-vline 
WA_RKMA1_STR-TABNA sy-vline 
WA_RKMA1_STR-GJAHR sy-vline 
WA_RKMA1_STR-NEWAB sy-vline 
WA_RKMA1_STR-NEWBI sy-vline 
WA_RKMA1_STR-TXFLG sy-vline 
WA_RKMA1_STR-KHINR sy-vline 
WA_RKMA1_STR-HITXT sy-vline 
WA_RKMA1_STR-BUKRS sy-vline 
WA_RKMA1_STR-KTEXT sy-vline 
WA_RKMA1_STR-KOSTL sy-vline 
WA_RKMA1_STR-GSBER sy-vline 
WA_RKMA1_STR-PMARK sy-vline 
WA_RKMA1_STR-POSNR sy-vline 
WA_RKMA1_STR-BUTXT sy-vline 
WA_RKMA1_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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