ABAP Select data from SAP table IWLFCUSTSTLSTIT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWLFCUSTSTLSTIT
*  INTO TABLE @DATA(IT_IWLFCUSTSTLSTIT2).
*--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_IWLFCUSTSTLSTIT INDEX 1 INTO DATA(WA_IWLFCUSTSTLSTIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWLFCUSTSTLSTIT>-MANDT = 1.
<IWLFCUSTSTLSTIT>-CUSTSETTLMTLIST = 1.
<IWLFCUSTSTLSTIT>-CUSTSETTLMTLISTITEM = 1.
<IWLFCUSTSTLSTIT>-REFSETTLMTDOC = 1.
<IWLFCUSTSTLSTIT>-CUSTSETTLMTLISTCURRENCY = 1.

ENDLOOP.

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

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


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field PAYERPARTY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IWLFCUSTSTLSTIT-PAYERPARTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWLFCUSTSTLSTIT-PAYERPARTY.
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_IWLFCUSTSTLSTIT_STR, 
MANDT TYPE STRING,
CUSTSETTLMTLIST TYPE STRING,
CUSTSETTLMTLISTITEM TYPE STRING,
REFSETTLMTDOC TYPE STRING,
CUSTSETTLMTLISTCURRENCY 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,
CUSTSETTLMTLISTITMISCANCLD TYPE STRING,
PRCDETNISINCMPLT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWLFCUSTSTLSTIT_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_IWLFCUSTSTLSTIT_STR-MANDT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-CUSTSETTLMTLIST sy-vline 
WA_IWLFCUSTSTLSTIT_STR-CUSTSETTLMTLISTITEM sy-vline 
WA_IWLFCUSTSTLSTIT_STR-REFSETTLMTDOC sy-vline 
WA_IWLFCUSTSTLSTIT_STR-CUSTSETTLMTLISTCURRENCY sy-vline 
WA_IWLFCUSTSTLSTIT_STR-SETTLMTDOCLISTITEMNETAMOUNT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-SETTLMTDOCLISTITEMTAXAMOUNT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-NONDEDUCTIBLEINPUTTAXAMOUNT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-SETTLMTREMUNERATIONNETAMT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-SETTLMTREMUNERATIONTAXAMT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-INVOICINGPARTY sy-vline 
WA_IWLFCUSTSTLSTIT_STR-PAYEEPARTY sy-vline 
WA_IWLFCUSTSTLSTIT_STR-BILLTOPARTY sy-vline 
WA_IWLFCUSTSTLSTIT_STR-PAYERPARTY sy-vline 
WA_IWLFCUSTSTLSTIT_STR-SETTLMTDOCCAT sy-vline 
WA_IWLFCUSTSTLSTIT_STR-CUSTSETTLMTLISTITMISCANCLD sy-vline 
WA_IWLFCUSTSTLSTIT_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.