ABAP Select data from SAP table IWLFSMTDCLSTITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWLFSMTDCLSTITEM
*  INTO TABLE @DATA(IT_IWLFSMTDCLSTITEM2).
*--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_IWLFSMTDCLSTITEM INDEX 1 INTO DATA(WA_IWLFSMTDCLSTITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWLFSMTDCLSTITEM>-MANDT = 1.
<IWLFSMTDCLSTITEM>-SETTLMTMGMTDOC = 1.
<IWLFSMTDCLSTITEM>-SETTLMTMGMTDOCLISTITEM = 1.
<IWLFSMTDCLSTITEM>-REFERENCESETTLMTMGMTDOC = 1.
<IWLFSMTDCLSTITEM>-SETTLMTDOCCURRENCY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWLFSMTDCLSTITEM-SETTLMTDOCLISTITEMNETAMOUNT, sy-vline,
  WA_IWLFSMTDCLSTITEM-SETTLMTDOCLISTITEMTAXAMOUNT, sy-vline,
  WA_IWLFSMTDCLSTITEM-NONDEDUCTIBLEINPUTTAXAMOUNT, sy-vline,
  WA_IWLFSMTDCLSTITEM-SETTLMTREMUNERATIONNETAMT, sy-vline,
  WA_IWLFSMTDCLSTITEM-SETTLMTREMUNERATIONTAXAMT, sy-vline,
  WA_IWLFSMTDCLSTITEM-INVOICINGPARTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWLFSMTDCLSTITEM 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_IWLFSMTDCLSTITEM 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_IWLFSMTDCLSTITEM INTO WA_IWLFSMTDCLSTITEM.


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

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

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

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

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

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

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

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

*Conversion exit GJAHR, internal->external for field SETTLMTEXTACCTGDOCFISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IWLFSMTDCLSTITEM-SETTLMTEXTACCTGDOCFISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWLFSMTDCLSTITEM-SETTLMTEXTACCTGDOCFISCALYEAR.
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_IWLFSMTDCLSTITEM_STR, 
MANDT TYPE STRING,
SETTLMTMGMTDOC TYPE STRING,
SETTLMTMGMTDOCLISTITEM TYPE STRING,
REFERENCESETTLMTMGMTDOC TYPE STRING,
SETTLMTDOCCURRENCY TYPE STRING,
SETTLMTDOCLISTITEMNETAMOUNT TYPE STRING,
SETTLMTDOCLISTITEMTAXAMOUNT TYPE STRING,
NONDEDUCTIBLEINPUTTAXAMOUNT TYPE STRING,
SETTLMTREMUNERATIONNETAMT TYPE STRING,
SETTLMTREMUNERATIONTAXAMT TYPE STRING,
INVOICINGPARTY TYPE STRING,
PAYEEPARTY TYPE STRING,
BILLTOPARTY TYPE STRING,
PAYERPARTY TYPE STRING,
SETTLMTDOCCAT TYPE STRING,
SETTLMTDOCLISTCAT TYPE STRING,
SETTLMTDOCLISTITEMCAT TYPE STRING,
SETTLMTEXTBILLGDOC TYPE STRING,
SETTLMTEXTACCTGDOC TYPE STRING,
SETTLMTEXTACCTGDOCFISCALYEAR TYPE STRING,
SETTLMTEXTACCTGDOCCOMPANYCODE TYPE STRING,
SETTLMTEXTACCTGDOCITEM TYPE STRING,
SETTLMTDOCLISTITEMISCANCELLED TYPE STRING,
PRCDETNISINCMPLT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWLFSMTDCLSTITEM_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_IWLFSMTDCLSTITEM_STR-MANDT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTMGMTDOC sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTMGMTDOCLISTITEM sy-vline 
WA_IWLFSMTDCLSTITEM_STR-REFERENCESETTLMTMGMTDOC sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCCURRENCY sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCLISTITEMNETAMOUNT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCLISTITEMTAXAMOUNT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-NONDEDUCTIBLEINPUTTAXAMOUNT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTREMUNERATIONNETAMT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTREMUNERATIONTAXAMT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-INVOICINGPARTY sy-vline 
WA_IWLFSMTDCLSTITEM_STR-PAYEEPARTY sy-vline 
WA_IWLFSMTDCLSTITEM_STR-BILLTOPARTY sy-vline 
WA_IWLFSMTDCLSTITEM_STR-PAYERPARTY sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCCAT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCLISTCAT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCLISTITEMCAT sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTEXTBILLGDOC sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTEXTACCTGDOC sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTEXTACCTGDOCFISCALYEAR sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTEXTACCTGDOCCOMPANYCODE sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTEXTACCTGDOCITEM sy-vline 
WA_IWLFSMTDCLSTITEM_STR-SETTLMTDOCLISTITEMISCANCELLED sy-vline 
WA_IWLFSMTDCLSTITEM_STR-PRCDETNISINCMPLT sy-vline      INTO ld_text SEPARATED BY SPACE.

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