ABAP Select data from SAP table FKK_INVOICE_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKK_INVOICE_ITEM
*  INTO TABLE @DATA(IT_FKK_INVOICE_ITEM2).
*--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_FKK_INVOICE_ITEM INDEX 1 INTO DATA(WA_FKK_INVOICE_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKK_INVOICE_ITEM>-INV_ID = 1.
<FKK_INVOICE_ITEM>-INV_ITEM_ID = 1.
<FKK_INVOICE_ITEM>-INV_ITEM_STATUS = 1.
<FKK_INVOICE_ITEM>-DOC_NO = 1.
<FKK_INVOICE_ITEM>-DOC_REP_ITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKK_INVOICE_ITEM-DOC_ITEM, sy-vline,
  WA_FKK_INVOICE_ITEM-DOC_DATE, sy-vline,
  WA_FKK_INVOICE_ITEM-POST_DATE, sy-vline,
  WA_FKK_INVOICE_ITEM-REF_DOC_NO, sy-vline,
  WA_FKK_INVOICE_ITEM-CLASS_KEY, sy-vline,
  WA_FKK_INVOICE_ITEM-BUSPARTNER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKK_INVOICE_ITEM 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_FKK_INVOICE_ITEM 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_FKK_INVOICE_ITEM INTO WA_FKK_INVOICE_ITEM.


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

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

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

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

*Conversion exit ALPHA, internal->external for field CONTRACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKK_INVOICE_ITEM-CONTRACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKK_INVOICE_ITEM-CONTRACT.
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_FKK_INVOICE_ITEM_STR, 
INV_ID TYPE STRING,
INV_ITEM_ID TYPE STRING,
INV_ITEM_STATUS TYPE STRING,
DOC_NO TYPE STRING,
DOC_REP_ITEM TYPE STRING,
DOC_ITEM TYPE STRING,
DOC_DATE TYPE STRING,
POST_DATE TYPE STRING,
REF_DOC_NO TYPE STRING,
CLASS_KEY TYPE STRING,
BUSPARTNER TYPE STRING,
CONT_ACCT TYPE STRING,
CONTRACT TYPE STRING,
SUB_APPLICATION TYPE STRING,
COMP_CODE TYPE STRING,
DUE_DATE TYPE STRING,
DISC_DUE TYPE STRING,
DEFERRAL TYPE STRING,
DISC_RATE TYPE STRING,
CURRENCY TYPE STRING,
AMOUNT TYPE STRING,
AMOUNT_DISC TYPE STRING,
AMOUNT_OPEN TYPE STRING,
ORI_CURRENCY TYPE STRING,
ORI_AMOUNT TYPE STRING,
ORI_AMOUNT_DISC TYPE STRING,
ORI_AMOUNT_OPEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKK_INVOICE_ITEM_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_FKK_INVOICE_ITEM_STR-INV_ID sy-vline 
WA_FKK_INVOICE_ITEM_STR-INV_ITEM_ID sy-vline 
WA_FKK_INVOICE_ITEM_STR-INV_ITEM_STATUS sy-vline 
WA_FKK_INVOICE_ITEM_STR-DOC_NO sy-vline 
WA_FKK_INVOICE_ITEM_STR-DOC_REP_ITEM sy-vline 
WA_FKK_INVOICE_ITEM_STR-DOC_ITEM sy-vline 
WA_FKK_INVOICE_ITEM_STR-DOC_DATE sy-vline 
WA_FKK_INVOICE_ITEM_STR-POST_DATE sy-vline 
WA_FKK_INVOICE_ITEM_STR-REF_DOC_NO sy-vline 
WA_FKK_INVOICE_ITEM_STR-CLASS_KEY sy-vline 
WA_FKK_INVOICE_ITEM_STR-BUSPARTNER sy-vline 
WA_FKK_INVOICE_ITEM_STR-CONT_ACCT sy-vline 
WA_FKK_INVOICE_ITEM_STR-CONTRACT sy-vline 
WA_FKK_INVOICE_ITEM_STR-SUB_APPLICATION sy-vline 
WA_FKK_INVOICE_ITEM_STR-COMP_CODE sy-vline 
WA_FKK_INVOICE_ITEM_STR-DUE_DATE sy-vline 
WA_FKK_INVOICE_ITEM_STR-DISC_DUE sy-vline 
WA_FKK_INVOICE_ITEM_STR-DEFERRAL sy-vline 
WA_FKK_INVOICE_ITEM_STR-DISC_RATE sy-vline 
WA_FKK_INVOICE_ITEM_STR-CURRENCY sy-vline 
WA_FKK_INVOICE_ITEM_STR-AMOUNT sy-vline 
WA_FKK_INVOICE_ITEM_STR-AMOUNT_DISC sy-vline 
WA_FKK_INVOICE_ITEM_STR-AMOUNT_OPEN sy-vline 
WA_FKK_INVOICE_ITEM_STR-ORI_CURRENCY sy-vline 
WA_FKK_INVOICE_ITEM_STR-ORI_AMOUNT sy-vline 
WA_FKK_INVOICE_ITEM_STR-ORI_AMOUNT_DISC sy-vline 
WA_FKK_INVOICE_ITEM_STR-ORI_AMOUNT_OPEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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