ABAP Select data from SAP table LK02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LK02 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 LK02. 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 LK02 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_LK02 TYPE STANDARD TABLE OF LK02,
      WA_LK02 TYPE LK02,
      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: <LK02> TYPE LK02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LK02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LK02
  INTO TABLE IT_LK02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LK02
*  INTO TABLE @DATA(IT_LK022).
*--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_LK02 INDEX 1 INTO DATA(WA_LK022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LK02 ASSIGNING <LK02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LK02>-MANDT = 1.
<LK02>-SAKOM = 1.
<LK02>-LGNUM = 1.
<LK02>-UBNUM = 1.
<LK02>-MBLNR = 1.

ENDLOOP.

LOOP AT IT_LK02 INTO WA_LK02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LK02-MJAHR, sy-vline,
  WA_LK02-MBPOS, sy-vline,
  WA_LK02-SMBLN, sy-vline,
  WA_LK02-SMBLP, sy-vline,
  WA_LK02-SJAHR, sy-vline,
  WA_LK02-WENUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LK02 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_LK02 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_LK02 INTO WA_LK02.


*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 MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LK02-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SMBLN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-SMBLN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-SMBLN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field SJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LK02-SJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-SJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-WENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-WENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATN1
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LK02-MATN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-MATN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-SONR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-SONR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATN2
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LK02-MATN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-MATN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-SONR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-SONR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK02-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ALTM1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK02-ALTM1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-ALTM1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QPLOS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-QPLOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-QPLOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QPLOA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK02-QPLOA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-QPLOA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LENUM, internal->external for field LENUM
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_LK02-LENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-LENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GWEI1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK02-GWEI1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-GWEI1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GWEI2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK02-GWEI2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK02-GWEI2.
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_LK02_STR, 
MANDT TYPE STRING,
SAKOM TYPE STRING,
LGNUM TYPE STRING,
UBNUM TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
MBPOS TYPE STRING,
SMBLN TYPE STRING,
SMBLP TYPE STRING,
SJAHR TYPE STRING,
WENUM TYPE STRING,
BNAME TYPE STRING,
BWART TYPE STRING,
BWLVS TYPE STRING,
TBPRI TYPE STRING,
MATN1 TYPE STRING,
WERK1 TYPE STRING,
LGOR1 TYPE STRING,
BSTQ1 TYPE STRING,
CHRG1 TYPE STRING,
SOKZ1 TYPE STRING,
SONR1 TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
MATN2 TYPE STRING,
WERK2 TYPE STRING,
LGOR2 TYPE STRING,
BSTQ2 TYPE STRING,
CHRG2 TYPE STRING,
SOKZ2 TYPE STRING,
SONR2 TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
MNGA1 TYPE STRING,
UMRN1 TYPE STRING,
UMRZ1 TYPE STRING,
ALTM1 TYPE STRING,
UBTXT TYPE STRING,
UBFKZ TYPE STRING,
LQNR1 TYPE STRING,
LQNR2 TYPE STRING,
QPLOS TYPE STRING,
QPLOA TYPE STRING,
DIRTA TYPE STRING,
AUTTA TYPE STRING,
HUPF1 TYPE STRING,
HUPF2 TYPE STRING,
LENUM TYPE STRING,
LETYP TYPE STRING,
LDUMM TYPE STRING,
GWEI1 TYPE STRING,
BRGW1 TYPE STRING,
GWEI2 TYPE STRING,
BRGW2 TYPE STRING,
QKAP1 TYPE STRING,
QKAP2 TYPE STRING,
LKAPA TYPE STRING,
KKAPV TYPE STRING,
MAXLE TYPE STRING,
PLPOS TYPE STRING,
STEIN TYPE STRING,
SUMME TYPE STRING,
PLAUF TYPE STRING,
WDATU TYPE STRING,
VFDAT_UMB TYPE STRING,
SGT_SCAT TYPE STRING,
SGT_UMSCAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LK02_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_LK02_STR-MANDT sy-vline 
WA_LK02_STR-SAKOM sy-vline 
WA_LK02_STR-LGNUM sy-vline 
WA_LK02_STR-UBNUM sy-vline 
WA_LK02_STR-MBLNR sy-vline 
WA_LK02_STR-MJAHR sy-vline 
WA_LK02_STR-MBPOS sy-vline 
WA_LK02_STR-SMBLN sy-vline 
WA_LK02_STR-SMBLP sy-vline 
WA_LK02_STR-SJAHR sy-vline 
WA_LK02_STR-WENUM sy-vline 
WA_LK02_STR-BNAME sy-vline 
WA_LK02_STR-BWART sy-vline 
WA_LK02_STR-BWLVS sy-vline 
WA_LK02_STR-TBPRI sy-vline 
WA_LK02_STR-MATN1 sy-vline 
WA_LK02_STR-WERK1 sy-vline 
WA_LK02_STR-LGOR1 sy-vline 
WA_LK02_STR-BSTQ1 sy-vline 
WA_LK02_STR-CHRG1 sy-vline 
WA_LK02_STR-SOKZ1 sy-vline 
WA_LK02_STR-SONR1 sy-vline 
WA_LK02_STR-LGTYP sy-vline 
WA_LK02_STR-LGPLA sy-vline 
WA_LK02_STR-MATN2 sy-vline 
WA_LK02_STR-WERK2 sy-vline 
WA_LK02_STR-LGOR2 sy-vline 
WA_LK02_STR-BSTQ2 sy-vline 
WA_LK02_STR-CHRG2 sy-vline 
WA_LK02_STR-SOKZ2 sy-vline 
WA_LK02_STR-SONR2 sy-vline 
WA_LK02_STR-MENGE sy-vline 
WA_LK02_STR-MEINS sy-vline 
WA_LK02_STR-MNGA1 sy-vline 
WA_LK02_STR-UMRN1 sy-vline 
WA_LK02_STR-UMRZ1 sy-vline 
WA_LK02_STR-ALTM1 sy-vline 
WA_LK02_STR-UBTXT sy-vline 
WA_LK02_STR-UBFKZ sy-vline 
WA_LK02_STR-LQNR1 sy-vline 
WA_LK02_STR-LQNR2 sy-vline 
WA_LK02_STR-QPLOS sy-vline 
WA_LK02_STR-QPLOA sy-vline 
WA_LK02_STR-DIRTA sy-vline 
WA_LK02_STR-AUTTA sy-vline 
WA_LK02_STR-HUPF1 sy-vline 
WA_LK02_STR-HUPF2 sy-vline 
WA_LK02_STR-LENUM sy-vline 
WA_LK02_STR-LETYP sy-vline 
WA_LK02_STR-LDUMM sy-vline 
WA_LK02_STR-GWEI1 sy-vline 
WA_LK02_STR-BRGW1 sy-vline 
WA_LK02_STR-GWEI2 sy-vline 
WA_LK02_STR-BRGW2 sy-vline 
WA_LK02_STR-QKAP1 sy-vline 
WA_LK02_STR-QKAP2 sy-vline 
WA_LK02_STR-LKAPA sy-vline 
WA_LK02_STR-KKAPV sy-vline 
WA_LK02_STR-MAXLE sy-vline 
WA_LK02_STR-PLPOS sy-vline 
WA_LK02_STR-STEIN sy-vline 
WA_LK02_STR-SUMME sy-vline 
WA_LK02_STR-PLAUF sy-vline 
WA_LK02_STR-WDATU sy-vline 
WA_LK02_STR-VFDAT_UMB sy-vline 
WA_LK02_STR-SGT_SCAT sy-vline 
WA_LK02_STR-SGT_UMSCAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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