ABAP Select data from SAP table RKB1N 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 RKB1N 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 RKB1N. 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 RKB1N 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_RKB1N TYPE STANDARD TABLE OF RKB1N,
      WA_RKB1N TYPE RKB1N,
      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: <RKB1N> TYPE RKB1N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKB1N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKB1N
  INTO TABLE IT_RKB1N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKB1N
*  INTO TABLE @DATA(IT_RKB1N2).
*--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_RKB1N INDEX 1 INTO DATA(WA_RKB1N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKB1N ASSIGNING <RKB1N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKB1N>-SMODUS = 1.
<RKB1N>-TRHANDLE = 1.
<RKB1N>-TRMODE = 1.
<RKB1N>-TXTKZ = 1.
<RKB1N>-TXTMT = 1.

ENDLOOP.

LOOP AT IT_RKB1N INTO WA_RKB1N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKB1N-BERTXT, sy-vline,
  WA_RKB1N-OK, sy-vline,
  WA_RKB1N-SPALTE, sy-vline,
  WA_RKB1N-LNMI1, sy-vline,
  WA_RKB1N-MWKZ, sy-vline,
  WA_RKB1N-DECIM_CURR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKB1N 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_RKB1N 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_RKB1N INTO WA_RKB1N.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RKB1N_STR, 
SMODUS TYPE STRING,
TRHANDLE TYPE STRING,
TRMODE TYPE STRING,
TXTKZ TYPE STRING,
TXTMT TYPE STRING,
BERTXT TYPE STRING,
OK TYPE STRING,
SPALTE TYPE STRING,
LNMI1 TYPE STRING,
MWKZ TYPE STRING,
DECIM_CURR TYPE STRING,
DECIM TYPE STRING,
ROUND TYPE STRING,
QUNR TYPE STRING,
KOMMA TYPE STRING,
CUKYD TYPE STRING,
WAERS1 TYPE STRING,
WAERS2 TYPE STRING,
WAERS3 TYPE STRING,
WAERS4 TYPE STRING,
WAERS5 TYPE STRING,
WAERS6 TYPE STRING,
WAERS_T1 TYPE STRING,
WAERS_T2 TYPE STRING,
WAERS_T3 TYPE STRING,
WAERS_T4 TYPE STRING,
WAERS_T5 TYPE STRING,
WAERS_T6 TYPE STRING,
ANZBP TYPE STRING,
ANZSP TYPE STRING,
BWRT TYPE STRING,
BOPE TYPE STRING,
TOPN TYPE STRING,
TOPP TYPE STRING,
ASCDESC TYPE STRING,
SUMME TYPE STRING,
COIXD TYPE STRING,
COIXDDAT TYPE STRING,
COIXDTIM TYPE STRING,
COIXDTS TYPE STRING,
COIXDTZONE TYPE STRING,
COIXDDAYST TYPE STRING,
COIXS TYPE STRING,
COIXSDAT TYPE STRING,
COIXSTIM TYPE STRING,
RCOIX TYPE STRING,
RART TYPE STRING,
LNUM TYPE STRING,
LTEXT TYPE STRING,
LART_BATCH TYPE STRING,
VARIANTE TYPE STRING,
ALIST TYPE STRING,
SAVEDAT TYPE STRING,
ATEXT TYPE STRING,
WTEXT1 TYPE STRING,
WTEXT2 TYPE STRING,
VTEXT TYPE STRING,
FMODCN TYPE STRING,
JDEST TYPE STRING,
JSOUR TYPE STRING,
FUNCT TYPE STRING,
HIEID TYPE STRING,
GTEXT TYPE STRING,
LFDID TYPE STRING,
CLTYP TYPE STRING,
CLSNR TYPE STRING,
TXT20 TYPE STRING,
SCREEN TYPE STRING,
PWUMR TYPE STRING,
NUMBR TYPE STRING,
PERIV TYPE STRING,
ANZ_X TYPE STRING,
EINHD TYPE STRING,
DIMPR TYPE STRING,
TEST TYPE STRING,
NEWEI TYPE STRING,
TITEL TYPE STRING,
REPWU TYPE STRING,
NEWPF TYPE STRING,
MODE TYPE STRING,
DIRECTORY TYPE STRING,
FILENR TYPE STRING,
SPOFF TYPE STRING,
KEYSP TYPE STRING,
KEYSP_DL TYPE STRING,
TXKYB TYPE STRING,
TXKYO TYPE STRING,
STUFE TYPE STRING,
HDAR TYPE STRING,
DISPO TYPE STRING,
SELDA TYPE STRING,
SELTI TYPE STRING,
DMMETHOD TYPE STRING,
PRINT_SO TYPE STRING,
NINDEX TYPE STRING,
SKTW TYPE STRING,
FILTER TYPE STRING,
NEUAUF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKB1N_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_RKB1N_STR-SMODUS sy-vline 
WA_RKB1N_STR-TRHANDLE sy-vline 
WA_RKB1N_STR-TRMODE sy-vline 
WA_RKB1N_STR-TXTKZ sy-vline 
WA_RKB1N_STR-TXTMT sy-vline 
WA_RKB1N_STR-BERTXT sy-vline 
WA_RKB1N_STR-OK sy-vline 
WA_RKB1N_STR-SPALTE sy-vline 
WA_RKB1N_STR-LNMI1 sy-vline 
WA_RKB1N_STR-MWKZ sy-vline 
WA_RKB1N_STR-DECIM_CURR sy-vline 
WA_RKB1N_STR-DECIM sy-vline 
WA_RKB1N_STR-ROUND sy-vline 
WA_RKB1N_STR-QUNR sy-vline 
WA_RKB1N_STR-KOMMA sy-vline 
WA_RKB1N_STR-CUKYD sy-vline 
WA_RKB1N_STR-WAERS1 sy-vline 
WA_RKB1N_STR-WAERS2 sy-vline 
WA_RKB1N_STR-WAERS3 sy-vline 
WA_RKB1N_STR-WAERS4 sy-vline 
WA_RKB1N_STR-WAERS5 sy-vline 
WA_RKB1N_STR-WAERS6 sy-vline 
WA_RKB1N_STR-WAERS_T1 sy-vline 
WA_RKB1N_STR-WAERS_T2 sy-vline 
WA_RKB1N_STR-WAERS_T3 sy-vline 
WA_RKB1N_STR-WAERS_T4 sy-vline 
WA_RKB1N_STR-WAERS_T5 sy-vline 
WA_RKB1N_STR-WAERS_T6 sy-vline 
WA_RKB1N_STR-ANZBP sy-vline 
WA_RKB1N_STR-ANZSP sy-vline 
WA_RKB1N_STR-BWRT sy-vline 
WA_RKB1N_STR-BOPE sy-vline 
WA_RKB1N_STR-TOPN sy-vline 
WA_RKB1N_STR-TOPP sy-vline 
WA_RKB1N_STR-ASCDESC sy-vline 
WA_RKB1N_STR-SUMME sy-vline 
WA_RKB1N_STR-COIXD sy-vline 
WA_RKB1N_STR-COIXDDAT sy-vline 
WA_RKB1N_STR-COIXDTIM sy-vline 
WA_RKB1N_STR-COIXDTS sy-vline 
WA_RKB1N_STR-COIXDTZONE sy-vline 
WA_RKB1N_STR-COIXDDAYST sy-vline 
WA_RKB1N_STR-COIXS sy-vline 
WA_RKB1N_STR-COIXSDAT sy-vline 
WA_RKB1N_STR-COIXSTIM sy-vline 
WA_RKB1N_STR-RCOIX sy-vline 
WA_RKB1N_STR-RART sy-vline 
WA_RKB1N_STR-LNUM sy-vline 
WA_RKB1N_STR-LTEXT sy-vline 
WA_RKB1N_STR-LART_BATCH sy-vline 
WA_RKB1N_STR-VARIANTE sy-vline 
WA_RKB1N_STR-ALIST sy-vline 
WA_RKB1N_STR-SAVEDAT sy-vline 
WA_RKB1N_STR-ATEXT sy-vline 
WA_RKB1N_STR-WTEXT1 sy-vline 
WA_RKB1N_STR-WTEXT2 sy-vline 
WA_RKB1N_STR-VTEXT sy-vline 
WA_RKB1N_STR-FMODCN sy-vline 
WA_RKB1N_STR-JDEST sy-vline 
WA_RKB1N_STR-JSOUR sy-vline 
WA_RKB1N_STR-FUNCT sy-vline 
WA_RKB1N_STR-HIEID sy-vline 
WA_RKB1N_STR-GTEXT sy-vline 
WA_RKB1N_STR-LFDID sy-vline 
WA_RKB1N_STR-CLTYP sy-vline 
WA_RKB1N_STR-CLSNR sy-vline 
WA_RKB1N_STR-TXT20 sy-vline 
WA_RKB1N_STR-SCREEN sy-vline 
WA_RKB1N_STR-PWUMR sy-vline 
WA_RKB1N_STR-NUMBR sy-vline 
WA_RKB1N_STR-PERIV sy-vline 
WA_RKB1N_STR-ANZ_X sy-vline 
WA_RKB1N_STR-EINHD sy-vline 
WA_RKB1N_STR-DIMPR sy-vline 
WA_RKB1N_STR-TEST sy-vline 
WA_RKB1N_STR-NEWEI sy-vline 
WA_RKB1N_STR-TITEL sy-vline 
WA_RKB1N_STR-REPWU sy-vline 
WA_RKB1N_STR-NEWPF sy-vline 
WA_RKB1N_STR-MODE sy-vline 
WA_RKB1N_STR-DIRECTORY sy-vline 
WA_RKB1N_STR-FILENR sy-vline 
WA_RKB1N_STR-SPOFF sy-vline 
WA_RKB1N_STR-KEYSP sy-vline 
WA_RKB1N_STR-KEYSP_DL sy-vline 
WA_RKB1N_STR-TXKYB sy-vline 
WA_RKB1N_STR-TXKYO sy-vline 
WA_RKB1N_STR-STUFE sy-vline 
WA_RKB1N_STR-HDAR sy-vline 
WA_RKB1N_STR-DISPO sy-vline 
WA_RKB1N_STR-SELDA sy-vline 
WA_RKB1N_STR-SELTI sy-vline 
WA_RKB1N_STR-DMMETHOD sy-vline 
WA_RKB1N_STR-PRINT_SO sy-vline 
WA_RKB1N_STR-NINDEX sy-vline 
WA_RKB1N_STR-SKTW sy-vline 
WA_RKB1N_STR-FILTER sy-vline 
WA_RKB1N_STR-NEUAUF sy-vline      INTO ld_text SEPARATED BY SPACE.

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