ABAP Select data from SAP table MWSTB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MWSTB
*  INTO TABLE @DATA(IT_MWSTB2).
*--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_MWSTB INDEX 1 INTO DATA(WA_MWSTB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MWSTB>-MWSKZ = 1.
<MWSTB>-BUKRS = 1.
<MWSTB>-HWBAS = 1.
<MWSTB>-FWBAS = 1.
<MWSTB>-HWBAD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MWSTB-FWBAD, sy-vline,
  WA_MWSTB-HWSKB, sy-vline,
  WA_MWSTB-HWSTE, sy-vline,
  WA_MWSTB-FWSTE, sy-vline,
  WA_MWSTB-HWSTD, sy-vline,
  WA_MWSTB-FWSTD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MWSTB 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_MWSTB 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_MWSTB INTO WA_MWSTB.


*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 AC152, internal->external for field HWBAS
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWBAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWBAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field FWBAS
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWBAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWBAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field HWBAD
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWBAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWBAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field FWBAD
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWBAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWBAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field HWSKB
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWSKB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWSKB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWSTE
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWSTE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWSTE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWSTE
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWSTE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWSTE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWSTD
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWSTD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWSTD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWSTD
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWSTD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWSTD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWNAF
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWNAF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWNAF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWNAF
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWNAF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWNAF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWNAD
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWNAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWNAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWNAD
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWNAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWNAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWNAG
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWNAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWNAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWNAG
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWNAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWNAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWZUZ
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWZUZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWZUZ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field FWZUZ
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWZUZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWZUZ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field HWZBA
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-HWZBA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-HWZBA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU152, internal->external for field FWZBA
CALL FUNCTION 'CONVERSION_EXIT_AU152_OUTPUT'
  EXPORTING
    input =                      WA_MWSTB-FWZBA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWSTB-FWZBA.
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_MWSTB_STR, 
MWSKZ TYPE STRING,
BUKRS TYPE STRING,
HWBAS TYPE STRING,
FWBAS TYPE STRING,
HWBAD TYPE STRING,
FWBAD TYPE STRING,
HWSKB TYPE STRING,
HWSTE TYPE STRING,
FWSTE TYPE STRING,
HWSTD TYPE STRING,
FWSTD TYPE STRING,
HWNAF TYPE STRING,
FWNAF TYPE STRING,
HWNAD TYPE STRING,
FWNAD TYPE STRING,
HWNAG TYPE STRING,
FWNAG TYPE STRING,
HWZUZ TYPE STRING,
FWZUZ TYPE STRING,
HWZBA TYPE STRING,
FWZBA TYPE STRING,
ANZPO TYPE STRING,
MSATZ TYPE STRING,
PRUEF TYPE STRING,
REART TYPE STRING,
RUNKZ TYPE STRING,
MWART TYPE STRING,
NAFPZ TYPE STRING,
NAFVT TYPE STRING,
ZKOVT TYPE STRING,
ZSABF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MWSTB_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_MWSTB_STR-MWSKZ sy-vline 
WA_MWSTB_STR-BUKRS sy-vline 
WA_MWSTB_STR-HWBAS sy-vline 
WA_MWSTB_STR-FWBAS sy-vline 
WA_MWSTB_STR-HWBAD sy-vline 
WA_MWSTB_STR-FWBAD sy-vline 
WA_MWSTB_STR-HWSKB sy-vline 
WA_MWSTB_STR-HWSTE sy-vline 
WA_MWSTB_STR-FWSTE sy-vline 
WA_MWSTB_STR-HWSTD sy-vline 
WA_MWSTB_STR-FWSTD sy-vline 
WA_MWSTB_STR-HWNAF sy-vline 
WA_MWSTB_STR-FWNAF sy-vline 
WA_MWSTB_STR-HWNAD sy-vline 
WA_MWSTB_STR-FWNAD sy-vline 
WA_MWSTB_STR-HWNAG sy-vline 
WA_MWSTB_STR-FWNAG sy-vline 
WA_MWSTB_STR-HWZUZ sy-vline 
WA_MWSTB_STR-FWZUZ sy-vline 
WA_MWSTB_STR-HWZBA sy-vline 
WA_MWSTB_STR-FWZBA sy-vline 
WA_MWSTB_STR-ANZPO sy-vline 
WA_MWSTB_STR-MSATZ sy-vline 
WA_MWSTB_STR-PRUEF sy-vline 
WA_MWSTB_STR-REART sy-vline 
WA_MWSTB_STR-RUNKZ sy-vline 
WA_MWSTB_STR-MWART sy-vline 
WA_MWSTB_STR-NAFPZ sy-vline 
WA_MWSTB_STR-NAFVT sy-vline 
WA_MWSTB_STR-ZKOVT sy-vline 
WA_MWSTB_STR-ZSABF sy-vline      INTO ld_text SEPARATED BY SPACE.

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