ABAP Select data from SAP table MT08M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MT08M 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 MT08M. 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 MT08M 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_MT08M TYPE STANDARD TABLE OF MT08M,
      WA_MT08M TYPE MT08M,
      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: <MT08M> TYPE MT08M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MT08M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MT08M
  INTO TABLE IT_MT08M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MT08M
*  INTO TABLE @DATA(IT_MT08M2).
*--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_MT08M INDEX 1 INTO DATA(WA_MT08M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MT08M ASSIGNING <MT08M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MT08M>-MAKTX = 1.
<MT08M>-MEINS = 1.
<MT08M>-STDPR = 1.
<MT08M>-KMBEW = 1.
<MT08M>-BWTTY = 1.

ENDLOOP.

LOOP AT IT_MT08M INTO WA_MT08M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MT08M-LBKUM, sy-vline,
  WA_MT08M-SALK3, sy-vline,
  WA_MT08M-SALKV, sy-vline,
  WA_MT08M-VPRSV, sy-vline,
  WA_MT08M-VERPR, sy-vline,
  WA_MT08M-STPRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MT08M 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_MT08M 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_MT08M INTO WA_MT08M.


*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 CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field STDPR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-STDPR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-STDPR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-LFGJA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PDATZ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-PDATZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-PDATZ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PDATL
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-PDATL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-PDATL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MT08M-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08M-PSPNR.
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_MT08M_STR, 
MAKTX TYPE STRING,
MEINS TYPE STRING,
STDPR TYPE STRING,
KMBEW TYPE STRING,
BWTTY TYPE STRING,
LBKUM TYPE STRING,
SALK3 TYPE STRING,
SALKV TYPE STRING,
VPRSV TYPE STRING,
VERPR TYPE STRING,
STPRS TYPE STRING,
PEINH TYPE STRING,
BKLAS TYPE STRING,
VMKUM TYPE STRING,
VMSAL TYPE STRING,
VMSAV TYPE STRING,
VMVPR TYPE STRING,
VMVER TYPE STRING,
VMSTP TYPE STRING,
VMPEI TYPE STRING,
VMBKL TYPE STRING,
VJKUM TYPE STRING,
VJSAL TYPE STRING,
VJSAV TYPE STRING,
VJVPR TYPE STRING,
VJVER TYPE STRING,
VJSTP TYPE STRING,
VJPEI TYPE STRING,
VJBKL TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
XLIFO TYPE STRING,
GSBER TYPE STRING,
PPRDZ TYPE STRING,
PDATZ TYPE STRING,
PPRDL TYPE STRING,
PDATL TYPE STRING,
MLMAA TYPE STRING,
VKSAL TYPE STRING,
ATTYP TYPE STRING,
MATNR TYPE STRING,
MLAST TYPE STRING,
WAART TYPE STRING,
HRKFT TYPE STRING,
WERTU TYPE STRING,
BWKEY TYPE STRING,
BWTAR TYPE STRING,
SOBKZ TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
PSPNR TYPE STRING,
MBRUE TYPE STRING,
KALN1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MT08M_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_MT08M_STR-MAKTX sy-vline 
WA_MT08M_STR-MEINS sy-vline 
WA_MT08M_STR-STDPR sy-vline 
WA_MT08M_STR-KMBEW sy-vline 
WA_MT08M_STR-BWTTY sy-vline 
WA_MT08M_STR-LBKUM sy-vline 
WA_MT08M_STR-SALK3 sy-vline 
WA_MT08M_STR-SALKV sy-vline 
WA_MT08M_STR-VPRSV sy-vline 
WA_MT08M_STR-VERPR sy-vline 
WA_MT08M_STR-STPRS sy-vline 
WA_MT08M_STR-PEINH sy-vline 
WA_MT08M_STR-BKLAS sy-vline 
WA_MT08M_STR-VMKUM sy-vline 
WA_MT08M_STR-VMSAL sy-vline 
WA_MT08M_STR-VMSAV sy-vline 
WA_MT08M_STR-VMVPR sy-vline 
WA_MT08M_STR-VMVER sy-vline 
WA_MT08M_STR-VMSTP sy-vline 
WA_MT08M_STR-VMPEI sy-vline 
WA_MT08M_STR-VMBKL sy-vline 
WA_MT08M_STR-VJKUM sy-vline 
WA_MT08M_STR-VJSAL sy-vline 
WA_MT08M_STR-VJSAV sy-vline 
WA_MT08M_STR-VJVPR sy-vline 
WA_MT08M_STR-VJVER sy-vline 
WA_MT08M_STR-VJSTP sy-vline 
WA_MT08M_STR-VJPEI sy-vline 
WA_MT08M_STR-VJBKL sy-vline 
WA_MT08M_STR-LFGJA sy-vline 
WA_MT08M_STR-LFMON sy-vline 
WA_MT08M_STR-XLIFO sy-vline 
WA_MT08M_STR-GSBER sy-vline 
WA_MT08M_STR-PPRDZ sy-vline 
WA_MT08M_STR-PDATZ sy-vline 
WA_MT08M_STR-PPRDL sy-vline 
WA_MT08M_STR-PDATL sy-vline 
WA_MT08M_STR-MLMAA sy-vline 
WA_MT08M_STR-VKSAL sy-vline 
WA_MT08M_STR-ATTYP sy-vline 
WA_MT08M_STR-MATNR sy-vline 
WA_MT08M_STR-MLAST sy-vline 
WA_MT08M_STR-WAART sy-vline 
WA_MT08M_STR-HRKFT sy-vline 
WA_MT08M_STR-WERTU sy-vline 
WA_MT08M_STR-BWKEY sy-vline 
WA_MT08M_STR-BWTAR sy-vline 
WA_MT08M_STR-SOBKZ sy-vline 
WA_MT08M_STR-VBELN sy-vline 
WA_MT08M_STR-POSNR sy-vline 
WA_MT08M_STR-PSPNR sy-vline 
WA_MT08M_STR-MBRUE sy-vline 
WA_MT08M_STR-KALN1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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