ABAP Select data from SAP table MLIT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLIT
*  INTO TABLE @DATA(IT_MLIT2).
*--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_MLIT INDEX 1 INTO DATA(WA_MLIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLIT>-MANDT = 1.
<MLIT>-BELNR = 1.
<MLIT>-KJAHR = 1.
<MLIT>-POSNR = 1.
<MLIT>-URZEILE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLIT-MATNR, sy-vline,
  WA_MLIT-BWTAR, sy-vline,
  WA_MLIT-BWKEY, sy-vline,
  WA_MLIT-KALNR, sy-vline,
  WA_MLIT-MEINS, sy-vline,
  WA_MLIT-SPART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLIT 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_MLIT 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_MLIT INTO WA_MLIT.


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

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

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

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

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MLIT-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLIT-PSPNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field PRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MLIT-PRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLIT-PRCTR.
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_MLIT_STR, 
MANDT TYPE STRING,
BELNR TYPE STRING,
KJAHR TYPE STRING,
POSNR TYPE STRING,
URZEILE TYPE STRING,
MATNR TYPE STRING,
BWTAR TYPE STRING,
BWKEY TYPE STRING,
KALNR TYPE STRING,
MEINS TYPE STRING,
SPART TYPE STRING,
GSBER TYPE STRING,
BWMOD TYPE STRING,
BUKRS TYPE STRING,
KTOPL TYPE STRING,
MLAST TYPE STRING,
PSART TYPE STRING,
BELNR_EA TYPE STRING,
KJAHR_EA TYPE STRING,
BELNR_MA TYPE STRING,
KJAHR_MA TYPE STRING,
ASCHEMA TYPE STRING,
PTYP TYPE STRING,
PTYP_KAT TYPE STRING,
PTYP_BVALT TYPE STRING,
PTYP_PROC TYPE STRING,
BEWARTGRP TYPE STRING,
KATEGORIE TYPE STRING,
BVALT TYPE STRING,
PROCESS TYPE STRING,
CSPLIT TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
PSPNR TYPE STRING,
LIFNR TYPE STRING,
KZBWS TYPE STRING,
XOBEW TYPE STRING,
SOBKZ TYPE STRING,
XABRERR TYPE STRING,
BELNR_CONS TYPE STRING,
KJAHR_CONS TYPE STRING,
BELNR_WIP TYPE STRING,
KJAHR_WIP TYPE STRING,
PRCTR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLIT_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_MLIT_STR-MANDT sy-vline 
WA_MLIT_STR-BELNR sy-vline 
WA_MLIT_STR-KJAHR sy-vline 
WA_MLIT_STR-POSNR sy-vline 
WA_MLIT_STR-URZEILE sy-vline 
WA_MLIT_STR-MATNR sy-vline 
WA_MLIT_STR-BWTAR sy-vline 
WA_MLIT_STR-BWKEY sy-vline 
WA_MLIT_STR-KALNR sy-vline 
WA_MLIT_STR-MEINS sy-vline 
WA_MLIT_STR-SPART sy-vline 
WA_MLIT_STR-GSBER sy-vline 
WA_MLIT_STR-BWMOD sy-vline 
WA_MLIT_STR-BUKRS sy-vline 
WA_MLIT_STR-KTOPL sy-vline 
WA_MLIT_STR-MLAST sy-vline 
WA_MLIT_STR-PSART sy-vline 
WA_MLIT_STR-BELNR_EA sy-vline 
WA_MLIT_STR-KJAHR_EA sy-vline 
WA_MLIT_STR-BELNR_MA sy-vline 
WA_MLIT_STR-KJAHR_MA sy-vline 
WA_MLIT_STR-ASCHEMA sy-vline 
WA_MLIT_STR-PTYP sy-vline 
WA_MLIT_STR-PTYP_KAT sy-vline 
WA_MLIT_STR-PTYP_BVALT sy-vline 
WA_MLIT_STR-PTYP_PROC sy-vline 
WA_MLIT_STR-BEWARTGRP sy-vline 
WA_MLIT_STR-KATEGORIE sy-vline 
WA_MLIT_STR-BVALT sy-vline 
WA_MLIT_STR-PROCESS sy-vline 
WA_MLIT_STR-CSPLIT sy-vline 
WA_MLIT_STR-VBELN sy-vline 
WA_MLIT_STR-VBELP sy-vline 
WA_MLIT_STR-PSPNR sy-vline 
WA_MLIT_STR-LIFNR sy-vline 
WA_MLIT_STR-KZBWS sy-vline 
WA_MLIT_STR-XOBEW sy-vline 
WA_MLIT_STR-SOBKZ sy-vline 
WA_MLIT_STR-XABRERR sy-vline 
WA_MLIT_STR-BELNR_CONS sy-vline 
WA_MLIT_STR-KJAHR_CONS sy-vline 
WA_MLIT_STR-BELNR_WIP sy-vline 
WA_MLIT_STR-KJAHR_WIP sy-vline 
WA_MLIT_STR-PRCTR sy-vline      INTO ld_text SEPARATED BY SPACE.

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