ABAP Select data from SAP table FKKTAXLIN_DOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKTAXLIN_DOC
*  INTO TABLE @DATA(IT_FKKTAXLIN_DOC2).
*--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_FKKTAXLIN_DOC INDEX 1 INTO DATA(WA_FKKTAXLIN_DOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKKTAXLIN_DOC>-MWSKZ = 1.
<FKKTAXLIN_DOC>-TXJCD = 1.
<FKKTAXLIN_DOC>-TXJCO = 1.
<FKKTAXLIN_DOC>-TXCNT = 1.
<FKKTAXLIN_DOC>-TXDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKKTAXLIN_DOC-TXEXK, sy-vline,
  WA_FKKTAXLIN_DOC-HKONT, sy-vline,
  WA_FKKTAXLIN_DOC-KTOSL, sy-vline,
  WA_FKKTAXLIN_DOC-KSCHL, sy-vline,
  WA_FKKTAXLIN_DOC-STPRZ, sy-vline,
  WA_FKKTAXLIN_DOC-SBASW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKKTAXLIN_DOC 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_FKKTAXLIN_DOC 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_FKKTAXLIN_DOC INTO WA_FKKTAXLIN_DOC.


*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 HKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKKTAXLIN_DOC-HKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKKTAXLIN_DOC-HKONT.
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_FKKTAXLIN_DOC_STR, 
MWSKZ TYPE STRING,
TXJCD TYPE STRING,
TXJCO TYPE STRING,
TXCNT TYPE STRING,
TXDAT TYPE STRING,
TXEXK TYPE STRING,
HKONT TYPE STRING,
KTOSL TYPE STRING,
KSCHL TYPE STRING,
STPRZ TYPE STRING,
SBASW TYPE STRING,
SBETW TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKTAXLIN_DOC_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_FKKTAXLIN_DOC_STR-MWSKZ sy-vline 
WA_FKKTAXLIN_DOC_STR-TXJCD sy-vline 
WA_FKKTAXLIN_DOC_STR-TXJCO sy-vline 
WA_FKKTAXLIN_DOC_STR-TXCNT sy-vline 
WA_FKKTAXLIN_DOC_STR-TXDAT sy-vline 
WA_FKKTAXLIN_DOC_STR-TXEXK sy-vline 
WA_FKKTAXLIN_DOC_STR-HKONT sy-vline 
WA_FKKTAXLIN_DOC_STR-KTOSL sy-vline 
WA_FKKTAXLIN_DOC_STR-KSCHL sy-vline 
WA_FKKTAXLIN_DOC_STR-STPRZ sy-vline 
WA_FKKTAXLIN_DOC_STR-SBASW sy-vline 
WA_FKKTAXLIN_DOC_STR-SBETW sy-vline 
WA_FKKTAXLIN_DOC_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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