ABAP Select data from SAP table MT08B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MT08B 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 MT08B. 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 MT08B 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_MT08B TYPE STANDARD TABLE OF MT08B,
      WA_MT08B TYPE MT08B,
      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: <MT08B> TYPE MT08B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MT08B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MT08B
  INTO TABLE IT_MT08B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MT08B
*  INTO TABLE @DATA(IT_MT08B2).
*--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_MT08B INDEX 1 INTO DATA(WA_MT08B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MT08B ASSIGNING <MT08B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MT08B>-STDPR = 1.
<MT08B>-KMBEW = 1.
<MT08B>-BWTTY = 1.
<MT08B>-LBKUM = 1.
<MT08B>-SALK3 = 1.

ENDLOOP.

LOOP AT IT_MT08B INTO WA_MT08B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MT08B-SALKV, sy-vline,
  WA_MT08B-VPRSV, sy-vline,
  WA_MT08B-VERPR, sy-vline,
  WA_MT08B-STPRS, sy-vline,
  WA_MT08B-PEINH, sy-vline,
  WA_MT08B-BKLAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MT08B 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_MT08B 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_MT08B INTO WA_MT08B.


*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 MATN1, internal->external for field STDPR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MT08B-STDPR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08B-STDPR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MT08B-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08B-LFGJA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MT08B-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08B-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MT08B-BASME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MT08B-BASME.
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_MT08B_STR, 
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,
MTART TYPE STRING,
MLMAA TYPE STRING,
MLAST TYPE STRING,
ATTYP TYPE STRING,
MATNR TYPE STRING,
WAART TYPE STRING,
BASME TYPE STRING,
HRKFT TYPE STRING,
HKMAT TYPE STRING,
WERTU TYPE STRING,
MBRUE TYPE STRING,
KALN1 TYPE STRING,
KALNR TYPE STRING,
LBWST TYPE STRING,
LPLPR TYPE STRING,
LPLPX TYPE STRING,
VKSAL TYPE STRING,
VMVKS TYPE STRING,
VJVKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MT08B_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_MT08B_STR-STDPR sy-vline 
WA_MT08B_STR-KMBEW sy-vline 
WA_MT08B_STR-BWTTY sy-vline 
WA_MT08B_STR-LBKUM sy-vline 
WA_MT08B_STR-SALK3 sy-vline 
WA_MT08B_STR-SALKV sy-vline 
WA_MT08B_STR-VPRSV sy-vline 
WA_MT08B_STR-VERPR sy-vline 
WA_MT08B_STR-STPRS sy-vline 
WA_MT08B_STR-PEINH sy-vline 
WA_MT08B_STR-BKLAS sy-vline 
WA_MT08B_STR-VMKUM sy-vline 
WA_MT08B_STR-VMSAL sy-vline 
WA_MT08B_STR-VMSAV sy-vline 
WA_MT08B_STR-VMVPR sy-vline 
WA_MT08B_STR-VMVER sy-vline 
WA_MT08B_STR-VMSTP sy-vline 
WA_MT08B_STR-VMPEI sy-vline 
WA_MT08B_STR-VMBKL sy-vline 
WA_MT08B_STR-VJKUM sy-vline 
WA_MT08B_STR-VJSAL sy-vline 
WA_MT08B_STR-VJSAV sy-vline 
WA_MT08B_STR-VJVPR sy-vline 
WA_MT08B_STR-VJVER sy-vline 
WA_MT08B_STR-VJSTP sy-vline 
WA_MT08B_STR-VJPEI sy-vline 
WA_MT08B_STR-VJBKL sy-vline 
WA_MT08B_STR-LFGJA sy-vline 
WA_MT08B_STR-LFMON sy-vline 
WA_MT08B_STR-XLIFO sy-vline 
WA_MT08B_STR-GSBER sy-vline 
WA_MT08B_STR-MTART sy-vline 
WA_MT08B_STR-MLMAA sy-vline 
WA_MT08B_STR-MLAST sy-vline 
WA_MT08B_STR-ATTYP sy-vline 
WA_MT08B_STR-MATNR sy-vline 
WA_MT08B_STR-WAART sy-vline 
WA_MT08B_STR-BASME sy-vline 
WA_MT08B_STR-HRKFT sy-vline 
WA_MT08B_STR-HKMAT sy-vline 
WA_MT08B_STR-WERTU sy-vline 
WA_MT08B_STR-MBRUE sy-vline 
WA_MT08B_STR-KALN1 sy-vline 
WA_MT08B_STR-KALNR sy-vline 
WA_MT08B_STR-LBWST sy-vline 
WA_MT08B_STR-LPLPR sy-vline 
WA_MT08B_STR-LPLPX sy-vline 
WA_MT08B_STR-VKSAL sy-vline 
WA_MT08B_STR-VMVKS sy-vline 
WA_MT08B_STR-VJVKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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