ABAP Select data from SAP table FKKINVDOC_CH_GFN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKINVDOC_CH_GFN
*  INTO TABLE @DATA(IT_FKKINVDOC_CH_GFN2).
*--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_FKKINVDOC_CH_GFN INDEX 1 INTO DATA(WA_FKKINVDOC_CH_GFN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKKINVDOC_CH_GFN>-CAINVOICINGDOCUMENT = 1.
<FKKINVDOC_CH_GFN>-CADOCUMENTNUMBER = 1.
<FKKINVDOC_CH_GFN>-CABPITEMNUMBER = 1.
<FKKINVDOC_CH_GFN>-CASEQUENCENUMBER = 1.
<FKKINVDOC_CH_GFN>-CADOCUMENTNUMBERSRCE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKKINVDOC_CH_GFN-CAREPETITIONITEMNUMBERSRCE, sy-vline,
  WA_FKKINVDOC_CH_GFN-CABUSINESSPARTNERITEMNMBRSRCE, sy-vline,
  WA_FKKINVDOC_CH_GFN-CASUBSTITUTEDOCUMENTNUMBERSRCE, sy-vline,
  WA_FKKINVDOC_CH_GFN-CAAMOUNTINTRANSACTIONCRCYSRCE, sy-vline,
  WA_FKKINVDOC_CH_GFN-TRANSACTIONCURRENCY, sy-vline,
  WA_FKKINVDOC_CH_GFN-CAINVCGCHRGANDDISCAMOUNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKKINVDOC_CH_GFN 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_FKKINVDOC_CH_GFN 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_FKKINVDOC_CH_GFN INTO WA_FKKINVDOC_CH_GFN.


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

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

*Conversion exit ALPHA, internal->external for field CASUBSTITUTEDOCUMENTNUMBERSRCE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKKINVDOC_CH_GFN-CASUBSTITUTEDOCUMENTNUMBERSRCE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKKINVDOC_CH_GFN-CASUBSTITUTEDOCUMENTNUMBERSRCE.
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_FKKINVDOC_CH_GFN_STR, 
CAINVOICINGDOCUMENT TYPE STRING,
CADOCUMENTNUMBER TYPE STRING,
CABPITEMNUMBER TYPE STRING,
CASEQUENCENUMBER TYPE STRING,
CADOCUMENTNUMBERSRCE TYPE STRING,
CAREPETITIONITEMNUMBERSRCE TYPE STRING,
CABUSINESSPARTNERITEMNMBRSRCE TYPE STRING,
CASUBSTITUTEDOCUMENTNUMBERSRCE TYPE STRING,
CAAMOUNTINTRANSACTIONCRCYSRCE TYPE STRING,
TRANSACTIONCURRENCY TYPE STRING,
CAINVCGCHRGANDDISCAMOUNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKINVDOC_CH_GFN_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_FKKINVDOC_CH_GFN_STR-CAINVOICINGDOCUMENT sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CADOCUMENTNUMBER sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CABPITEMNUMBER sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CASEQUENCENUMBER sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CADOCUMENTNUMBERSRCE sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CAREPETITIONITEMNUMBERSRCE sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CABUSINESSPARTNERITEMNMBRSRCE sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CASUBSTITUTEDOCUMENTNUMBERSRCE sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CAAMOUNTINTRANSACTIONCRCYSRCE sy-vline 
WA_FKKINVDOC_CH_GFN_STR-TRANSACTIONCURRENCY sy-vline 
WA_FKKINVDOC_CH_GFN_STR-CAINVCGCHRGANDDISCAMOUNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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