ABAP Select data from SAP table IWLFSTDOCITPART into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWLFSTDOCITPART
*  INTO TABLE @DATA(IT_IWLFSTDOCITPART2).
*--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_IWLFSTDOCITPART INDEX 1 INTO DATA(WA_IWLFSTDOCITPART2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWLFSTDOCITPART>-MANDT = 1.
<IWLFSTDOCITPART>-SETTLMTDOC = 1.
<IWLFSTDOCITPART>-SETTLMTDOCITEM = 1.
<IWLFSTDOCITPART>-PARTNERFUNCTION = 1.
<IWLFSTDOCITPART>-PARTNERCOUNTER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWLFSTDOCITPART-CREATEDBYUSER, sy-vline,
  WA_IWLFSTDOCITPART-CREATIONDATE, sy-vline,
  WA_IWLFSTDOCITPART-SUPPLIER, sy-vline,
  WA_IWLFSTDOCITPART-CUSTOMER, sy-vline,
  WA_IWLFSTDOCITPART-CONTACTPERSON, sy-vline,
  WA_IWLFSTDOCITPART-PERSONNEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWLFSTDOCITPART 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_IWLFSTDOCITPART 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_IWLFSTDOCITPART INTO WA_IWLFSTDOCITPART.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field BPREFADDRESSIDFORDOCSPCFCADDR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IWLFSTDOCITPART-BPREFADDRESSIDFORDOCSPCFCADDR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWLFSTDOCITPART-BPREFADDRESSIDFORDOCSPCFCADDR.
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_IWLFSTDOCITPART_STR, 
MANDT TYPE STRING,
SETTLMTDOC TYPE STRING,
SETTLMTDOCITEM TYPE STRING,
PARTNERFUNCTION TYPE STRING,
PARTNERCOUNTER TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATE TYPE STRING,
SUPPLIER TYPE STRING,
CUSTOMER TYPE STRING,
CONTACTPERSON TYPE STRING,
PERSONNEL TYPE STRING,
ADDRESSID TYPE STRING,
ADDRESSPERSONID TYPE STRING,
REFERENCEBUSINESSPARTNER TYPE STRING,
SETTLMTDOCPARTADDRREFTYPE TYPE STRING,
ADDRESSOBJECTTYPE TYPE STRING,
BPADDRDETERMINATIONTRANSACTION TYPE STRING,
BPREFADDRESSIDFORDOCSPCFCADDR TYPE STRING,
VATREGISTRATION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWLFSTDOCITPART_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_IWLFSTDOCITPART_STR-MANDT sy-vline 
WA_IWLFSTDOCITPART_STR-SETTLMTDOC sy-vline 
WA_IWLFSTDOCITPART_STR-SETTLMTDOCITEM sy-vline 
WA_IWLFSTDOCITPART_STR-PARTNERFUNCTION sy-vline 
WA_IWLFSTDOCITPART_STR-PARTNERCOUNTER sy-vline 
WA_IWLFSTDOCITPART_STR-CREATEDBYUSER sy-vline 
WA_IWLFSTDOCITPART_STR-CREATIONDATE sy-vline 
WA_IWLFSTDOCITPART_STR-SUPPLIER sy-vline 
WA_IWLFSTDOCITPART_STR-CUSTOMER sy-vline 
WA_IWLFSTDOCITPART_STR-CONTACTPERSON sy-vline 
WA_IWLFSTDOCITPART_STR-PERSONNEL sy-vline 
WA_IWLFSTDOCITPART_STR-ADDRESSID sy-vline 
WA_IWLFSTDOCITPART_STR-ADDRESSPERSONID sy-vline 
WA_IWLFSTDOCITPART_STR-REFERENCEBUSINESSPARTNER sy-vline 
WA_IWLFSTDOCITPART_STR-SETTLMTDOCPARTADDRREFTYPE sy-vline 
WA_IWLFSTDOCITPART_STR-ADDRESSOBJECTTYPE sy-vline 
WA_IWLFSTDOCITPART_STR-BPADDRDETERMINATIONTRANSACTION sy-vline 
WA_IWLFSTDOCITPART_STR-BPREFADDRESSIDFORDOCSPCFCADDR sy-vline 
WA_IWLFSTDOCITPART_STR-VATREGISTRATION sy-vline      INTO ld_text SEPARATED BY SPACE.

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