ABAP Select data from SAP table RFKA1_GFN into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKA1_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 RFKA1_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 RFKA1_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_RFKA1_GFN TYPE STANDARD TABLE OF RFKA1_GFN,
      WA_RFKA1_GFN TYPE RFKA1_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: <RFKA1_GFN> TYPE RFKA1_GFN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKA1_GFN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKA1_GFN
  INTO TABLE IT_RFKA1_GFN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKA1_GFN
*  INTO TABLE @DATA(IT_RFKA1_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_RFKA1_GFN INDEX 1 INTO DATA(WA_RFKA1_GFN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKA1_GFN ASSIGNING <RFKA1_GFN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKA1_GFN>-COMPANYCODE = 1.
<RFKA1_GFN>-CACOSTACCTGACCOUNTASSGMTKEY = 1.
<RFKA1_GFN>-CADOCUMENTNUMBER = 1.
<RFKA1_GFN>-CAREFERENCEDOCUMENT = 1.
<RFKA1_GFN>-BUSINESSPARTNER = 1.

ENDLOOP.

LOOP AT IT_RFKA1_GFN INTO WA_RFKA1_GFN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKA1_GFN-CONTRACTACCOUNT, sy-vline,
  WA_RFKA1_GFN-CACONTRACT, sy-vline,
  WA_RFKA1_GFN-CASUBAPPLICATION, sy-vline,
  WA_RFKA1_GFN-CACLASSIFICATIONKEY, sy-vline,
  WA_RFKA1_GFN-CACHECKLEVELFOROPENDOCITEM, sy-vline,
  WA_RFKA1_GFN-CAPOSTINGDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKA1_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_RFKA1_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_RFKA1_GFN INTO WA_RFKA1_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_RFKA1_GFN-CADOCUMENTNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1_GFN-CADOCUMENTNUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CAREFERENCEDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1_GFN-CAREFERENCEDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1_GFN-CAREFERENCEDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BUSINESSPARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1_GFN-BUSINESSPARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1_GFN-BUSINESSPARTNER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CONTRACTACCOUNT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1_GFN-CONTRACTACCOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1_GFN-CONTRACTACCOUNT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CACONTRACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKA1_GFN-CACONTRACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKA1_GFN-CACONTRACT.
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_RFKA1_GFN_STR, 
COMPANYCODE TYPE STRING,
CACOSTACCTGACCOUNTASSGMTKEY TYPE STRING,
CADOCUMENTNUMBER TYPE STRING,
CAREFERENCEDOCUMENT TYPE STRING,
BUSINESSPARTNER TYPE STRING,
CONTRACTACCOUNT TYPE STRING,
CACONTRACT TYPE STRING,
CASUBAPPLICATION TYPE STRING,
CACLASSIFICATIONKEY TYPE STRING,
CACHECKLEVELFOROPENDOCITEM TYPE STRING,
CAPOSTINGDATE TYPE STRING,
DOCUMENTDATE TYPE STRING,
CADOCUMENTTYPE TYPE STRING,
CARECONCILIATIONKEY TYPE STRING,
CACLEARINGREASON TYPE STRING,
CADOCUMENTORIGINCODE TYPE STRING,
CAWRITEOFFREASON TYPE STRING,
TRANSACTIONCURRENCY TYPE STRING,
CAWRITEOFFISDONEWITHOUTCHKRULE TYPE STRING,
CAISSUBMITTEDTOCOLLAGENCY TYPE STRING,
CACOSTACCTGACCOUNTASSGMTDETN TYPE STRING,
CAFUNDSMGMTACCOUNTASSGMTDETN TYPE STRING,
CAGENLDGRACCTISFRMWRTOFFDOCITM TYPE STRING,
CONTRACTACCOUNTNAME TYPE STRING,
CAWRITEOFFHASNOTAXADJUSTMENT TYPE STRING,
CAWRITEOFFISDONEBYEXTSYSTEM TYPE STRING,
TAXCODE TYPE STRING,
CARTNTNPERIODOFITEMIZATIONVAL TYPE STRING,
CAWRITEOFFISDONEFORDWNPAYTREQ TYPE STRING,
CAINVCGWRITEOFFREASON TYPE STRING,
CAAMOUNTINTRANSACTIONCURRENCY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKA1_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_RFKA1_GFN_STR-COMPANYCODE sy-vline 
WA_RFKA1_GFN_STR-CACOSTACCTGACCOUNTASSGMTKEY sy-vline 
WA_RFKA1_GFN_STR-CADOCUMENTNUMBER sy-vline 
WA_RFKA1_GFN_STR-CAREFERENCEDOCUMENT sy-vline 
WA_RFKA1_GFN_STR-BUSINESSPARTNER sy-vline 
WA_RFKA1_GFN_STR-CONTRACTACCOUNT sy-vline 
WA_RFKA1_GFN_STR-CACONTRACT sy-vline 
WA_RFKA1_GFN_STR-CASUBAPPLICATION sy-vline 
WA_RFKA1_GFN_STR-CACLASSIFICATIONKEY sy-vline 
WA_RFKA1_GFN_STR-CACHECKLEVELFOROPENDOCITEM sy-vline 
WA_RFKA1_GFN_STR-CAPOSTINGDATE sy-vline 
WA_RFKA1_GFN_STR-DOCUMENTDATE sy-vline 
WA_RFKA1_GFN_STR-CADOCUMENTTYPE sy-vline 
WA_RFKA1_GFN_STR-CARECONCILIATIONKEY sy-vline 
WA_RFKA1_GFN_STR-CACLEARINGREASON sy-vline 
WA_RFKA1_GFN_STR-CADOCUMENTORIGINCODE sy-vline 
WA_RFKA1_GFN_STR-CAWRITEOFFREASON sy-vline 
WA_RFKA1_GFN_STR-TRANSACTIONCURRENCY sy-vline 
WA_RFKA1_GFN_STR-CAWRITEOFFISDONEWITHOUTCHKRULE sy-vline 
WA_RFKA1_GFN_STR-CAISSUBMITTEDTOCOLLAGENCY sy-vline 
WA_RFKA1_GFN_STR-CACOSTACCTGACCOUNTASSGMTDETN sy-vline 
WA_RFKA1_GFN_STR-CAFUNDSMGMTACCOUNTASSGMTDETN sy-vline 
WA_RFKA1_GFN_STR-CAGENLDGRACCTISFRMWRTOFFDOCITM sy-vline 
WA_RFKA1_GFN_STR-CONTRACTACCOUNTNAME sy-vline 
WA_RFKA1_GFN_STR-CAWRITEOFFHASNOTAXADJUSTMENT sy-vline 
WA_RFKA1_GFN_STR-CAWRITEOFFISDONEBYEXTSYSTEM sy-vline 
WA_RFKA1_GFN_STR-TAXCODE sy-vline 
WA_RFKA1_GFN_STR-CARTNTNPERIODOFITEMIZATIONVAL sy-vline 
WA_RFKA1_GFN_STR-CAWRITEOFFISDONEFORDWNPAYTREQ sy-vline 
WA_RFKA1_GFN_STR-CAINVCGWRITEOFFREASON sy-vline 
WA_RFKA1_GFN_STR-CAAMOUNTINTRANSACTIONCURRENCY sy-vline      INTO ld_text SEPARATED BY SPACE.

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