ABAP Select data from SAP table IFATAXITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IFATAXITEM
*  INTO TABLE @DATA(IT_IFATAXITEM2).
*--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_IFATAXITEM INDEX 1 INTO DATA(WA_IFATAXITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IFATAXITEM>-MANDT = 1.
<IFATAXITEM>-ACCOUNTINGDOCUMENT = 1.
<IFATAXITEM>-COMPANYCODE = 1.
<IFATAXITEM>-FISCALYEAR = 1.
<IFATAXITEM>-ACCOUNTINGDOCUMENTITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IFATAXITEM-TAXGROUP, sy-vline,
  WA_IFATAXITEM-DOCUMENTREFERENCEID, sy-vline,
  WA_IFATAXITEM-QUANTITY, sy-vline,
  WA_IFATAXITEM-COMPANYCODECURRENCY, sy-vline,
  WA_IFATAXITEM-AMOUNTINCOMPANYCODECURRENCY, sy-vline,
  WA_IFATAXITEM-DOCUMENTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IFATAXITEM 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_IFATAXITEM 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_IFATAXITEM INTO WA_IFATAXITEM.


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

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

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

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

*Conversion exit ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IFATAXITEM-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFATAXITEM-CUSTOMER.
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_IFATAXITEM_STR, 
MANDT TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
COMPANYCODE TYPE STRING,
FISCALYEAR TYPE STRING,
ACCOUNTINGDOCUMENTITEM TYPE STRING,
TAXGROUP TYPE STRING,
DOCUMENTREFERENCEID TYPE STRING,
QUANTITY TYPE STRING,
COMPANYCODECURRENCY TYPE STRING,
AMOUNTINCOMPANYCODECURRENCY TYPE STRING,
DOCUMENTDATE TYPE STRING,
POSTINGDATE TYPE STRING,
REPORTINGDATE TYPE STRING,
TAIWANESECALENDARYEAR TYPE STRING,
FISCALPERIOD TYPE STRING,
TAXAMOUNT TYPE STRING,
TAXITEMGROUP TYPE STRING,
BUSINESSPLACE TYPE STRING,
TAXCODE TYPE STRING,
TAXRATE TYPE STRING,
TAXRATEVALIDITYSTARTDATE TYPE STRING,
SUPPLIER TYPE STRING,
CUSTOMER TYPE STRING,
CUSTOMERCOUNTRY TYPE STRING,
SUPPLIERCOUNTRY TYPE STRING,
ACCOUNTINGDOCUMENTCLASS TYPE STRING,
FIXEDASSETDESCRIPTION TYPE STRING,
ASSETADDITIONALDESCRIPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IFATAXITEM_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_IFATAXITEM_STR-MANDT sy-vline 
WA_IFATAXITEM_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_IFATAXITEM_STR-COMPANYCODE sy-vline 
WA_IFATAXITEM_STR-FISCALYEAR sy-vline 
WA_IFATAXITEM_STR-ACCOUNTINGDOCUMENTITEM sy-vline 
WA_IFATAXITEM_STR-TAXGROUP sy-vline 
WA_IFATAXITEM_STR-DOCUMENTREFERENCEID sy-vline 
WA_IFATAXITEM_STR-QUANTITY sy-vline 
WA_IFATAXITEM_STR-COMPANYCODECURRENCY sy-vline 
WA_IFATAXITEM_STR-AMOUNTINCOMPANYCODECURRENCY sy-vline 
WA_IFATAXITEM_STR-DOCUMENTDATE sy-vline 
WA_IFATAXITEM_STR-POSTINGDATE sy-vline 
WA_IFATAXITEM_STR-REPORTINGDATE sy-vline 
WA_IFATAXITEM_STR-TAIWANESECALENDARYEAR sy-vline 
WA_IFATAXITEM_STR-FISCALPERIOD sy-vline 
WA_IFATAXITEM_STR-TAXAMOUNT sy-vline 
WA_IFATAXITEM_STR-TAXITEMGROUP sy-vline 
WA_IFATAXITEM_STR-BUSINESSPLACE sy-vline 
WA_IFATAXITEM_STR-TAXCODE sy-vline 
WA_IFATAXITEM_STR-TAXRATE sy-vline 
WA_IFATAXITEM_STR-TAXRATEVALIDITYSTARTDATE sy-vline 
WA_IFATAXITEM_STR-SUPPLIER sy-vline 
WA_IFATAXITEM_STR-CUSTOMER sy-vline 
WA_IFATAXITEM_STR-CUSTOMERCOUNTRY sy-vline 
WA_IFATAXITEM_STR-SUPPLIERCOUNTRY sy-vline 
WA_IFATAXITEM_STR-ACCOUNTINGDOCUMENTCLASS sy-vline 
WA_IFATAXITEM_STR-FIXEDASSETDESCRIPTION sy-vline 
WA_IFATAXITEM_STR-ASSETADDITIONALDESCRIPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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