ABAP Select data from SAP table MT08K into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MT08K 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 MT08K. 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 MT08K 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_MT08K TYPE STANDARD TABLE OF MT08K,
      WA_MT08K TYPE MT08K,
      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: <MT08K> TYPE MT08K.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MT08K.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MT08K
  INTO TABLE IT_MT08K.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MT08K
*  INTO TABLE @DATA(IT_MT08K2).
*--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_MT08K INDEX 1 INTO DATA(WA_MT08K2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MT08K ASSIGNING <MT08K>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MT08K>-MEINS = 1.
<MT08K>-BWTTY = 1.
<MT08K>-LBKUM = 1.
<MT08K>-SALK3 = 1.
<MT08K>-SALKV = 1.

ENDLOOP.

LOOP AT IT_MT08K INTO WA_MT08K.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MT08K-VPRSV, sy-vline,
  WA_MT08K-VERPR, sy-vline,
  WA_MT08K-STPRS, sy-vline,
  WA_MT08K-PEINH, sy-vline,
  WA_MT08K-BKLAS, sy-vline,
  WA_MT08K-VMKUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MT08K 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_MT08K 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_MT08K INTO WA_MT08K.


*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_MT08K-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08K-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08K-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08K-LFGJA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PDATZ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08K-PDATZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08K-PDATZ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PDATL
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08K-PDATL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08K-PDATL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PDATV
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08K-PDATV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08K-PDATV.
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_MT08K_STR, 
MEINS 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,
GSBER TYPE STRING,
BWVA1 TYPE STRING,
BWVA2 TYPE STRING,
BWVA3 TYPE STRING,
VERS1 TYPE STRING,
VERS2 TYPE STRING,
VERS3 TYPE STRING,
PPRDZ TYPE STRING,
PPRDL TYPE STRING,
PPRDV TYPE STRING,
PDATZ TYPE STRING,
PDATL TYPE STRING,
PDATV TYPE STRING,
KALKZ TYPE STRING,
KALKL TYPE STRING,
KALKV TYPE STRING,
ZPLPR TYPE STRING,
KALN1 TYPE STRING,
KALNR TYPE STRING,
MLMAA TYPE STRING,
HRKFT TYPE STRING,
WERTU TYPE STRING,
MBRUE TYPE STRING,
LPLPR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MT08K_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_MT08K_STR-MEINS sy-vline 
WA_MT08K_STR-BWTTY sy-vline 
WA_MT08K_STR-LBKUM sy-vline 
WA_MT08K_STR-SALK3 sy-vline 
WA_MT08K_STR-SALKV sy-vline 
WA_MT08K_STR-VPRSV sy-vline 
WA_MT08K_STR-VERPR sy-vline 
WA_MT08K_STR-STPRS sy-vline 
WA_MT08K_STR-PEINH sy-vline 
WA_MT08K_STR-BKLAS sy-vline 
WA_MT08K_STR-VMKUM sy-vline 
WA_MT08K_STR-VMSAL sy-vline 
WA_MT08K_STR-VMSAV sy-vline 
WA_MT08K_STR-VMVPR sy-vline 
WA_MT08K_STR-VMVER sy-vline 
WA_MT08K_STR-VMSTP sy-vline 
WA_MT08K_STR-VMPEI sy-vline 
WA_MT08K_STR-VMBKL sy-vline 
WA_MT08K_STR-VJKUM sy-vline 
WA_MT08K_STR-VJSAL sy-vline 
WA_MT08K_STR-VJSAV sy-vline 
WA_MT08K_STR-VJVPR sy-vline 
WA_MT08K_STR-VJVER sy-vline 
WA_MT08K_STR-VJSTP sy-vline 
WA_MT08K_STR-VJPEI sy-vline 
WA_MT08K_STR-VJBKL sy-vline 
WA_MT08K_STR-LFGJA sy-vline 
WA_MT08K_STR-LFMON sy-vline 
WA_MT08K_STR-GSBER sy-vline 
WA_MT08K_STR-BWVA1 sy-vline 
WA_MT08K_STR-BWVA2 sy-vline 
WA_MT08K_STR-BWVA3 sy-vline 
WA_MT08K_STR-VERS1 sy-vline 
WA_MT08K_STR-VERS2 sy-vline 
WA_MT08K_STR-VERS3 sy-vline 
WA_MT08K_STR-PPRDZ sy-vline 
WA_MT08K_STR-PPRDL sy-vline 
WA_MT08K_STR-PPRDV sy-vline 
WA_MT08K_STR-PDATZ sy-vline 
WA_MT08K_STR-PDATL sy-vline 
WA_MT08K_STR-PDATV sy-vline 
WA_MT08K_STR-KALKZ sy-vline 
WA_MT08K_STR-KALKL sy-vline 
WA_MT08K_STR-KALKV sy-vline 
WA_MT08K_STR-ZPLPR sy-vline 
WA_MT08K_STR-KALN1 sy-vline 
WA_MT08K_STR-KALNR sy-vline 
WA_MT08K_STR-MLMAA sy-vline 
WA_MT08K_STR-HRKFT sy-vline 
WA_MT08K_STR-WERTU sy-vline 
WA_MT08K_STR-MBRUE sy-vline 
WA_MT08K_STR-LPLPR sy-vline      INTO ld_text SEPARATED BY SPACE.

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