ABAP Select data from SAP table IDWT_ES_S_WTAX_RETURNS_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDWT_ES_S_WTAX_RETURNS_ALV
*  INTO TABLE @DATA(IT_IDWT_ES_S_WTAX_RETURNS_ALV2).
*--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_IDWT_ES_S_WTAX_RETURNS_ALV INDEX 1 INTO DATA(WA_IDWT_ES_S_WTAX_RETURNS_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDWT_ES_S_WTAX_RETURNS_ALV>-BUKRS = 1.
<IDWT_ES_S_WTAX_RETURNS_ALV>-LIEFER = 1.
<IDWT_ES_S_WTAX_RETURNS_ALV>-TAX_NUM = 1.
<IDWT_ES_S_WTAX_RETURNS_ALV>-L_ADRESS = 1.
<IDWT_ES_S_WTAX_RETURNS_ALV>-WITHT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDWT_ES_S_WTAX_RETURNS_ALV-QSSKZ, sy-vline,
  WA_IDWT_ES_S_WTAX_RETURNS_ALV-BUDAT, sy-vline,
  WA_IDWT_ES_S_WTAX_RETURNS_ALV-BELNR, sy-vline,
  WA_IDWT_ES_S_WTAX_RETURNS_ALV-BLDAT, sy-vline,
  WA_IDWT_ES_S_WTAX_RETURNS_ALV-XBLNR, sy-vline,
  WA_IDWT_ES_S_WTAX_RETURNS_ALV-AUGDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDWT_ES_S_WTAX_RETURNS_ALV 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_IDWT_ES_S_WTAX_RETURNS_ALV 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_IDWT_ES_S_WTAX_RETURNS_ALV INTO WA_IDWT_ES_S_WTAX_RETURNS_ALV.


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

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

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

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

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

*Conversion exit AC152, internal->external for field NETTH
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_IDWT_ES_S_WTAX_RETURNS_ALV-NETTH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDWT_ES_S_WTAX_RETURNS_ALV-NETTH.
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_IDWT_ES_S_WTAX_RETURNS_ALV_STR, 
BUKRS TYPE STRING,
LIEFER TYPE STRING,
TAX_NUM TYPE STRING,
L_ADRESS TYPE STRING,
WITHT TYPE STRING,
QSSKZ TYPE STRING,
BUDAT TYPE STRING,
BELNR TYPE STRING,
BLDAT TYPE STRING,
XBLNR TYPE STRING,
AUGDT TYPE STRING,
DMBTR TYPE STRING,
QSSHH TYPE STRING,
QBSHH TYPE STRING,
NETTH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDWT_ES_S_WTAX_RETURNS_ALV_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_IDWT_ES_S_WTAX_RETURNS_ALV_STR-BUKRS sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-LIEFER sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-TAX_NUM sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-L_ADRESS sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-WITHT sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-QSSKZ sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-BUDAT sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-BELNR sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-BLDAT sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-XBLNR sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-AUGDT sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-DMBTR sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-QSSHH sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-QBSHH sy-vline 
WA_IDWT_ES_S_WTAX_RETURNS_ALV_STR-NETTH sy-vline      INTO ld_text SEPARATED BY SPACE.

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