ABAP Select data from SAP table REEX_ACC_DOC_EXT_FI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REEX_ACC_DOC_EXT_FI
*  INTO TABLE @DATA(IT_REEX_ACC_DOC_EXT_FI2).
*--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_REEX_ACC_DOC_EXT_FI INDEX 1 INTO DATA(WA_REEX_ACC_DOC_EXT_FI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REEX_ACC_DOC_EXT_FI>-ITEMNO = 1.
<REEX_ACC_DOC_EXT_FI>-AMTRANSTYPE = 1.
<REEX_ACC_DOC_EXT_FI>-TCOBJNR = 1.
<REEX_ACC_DOC_EXT_FI>-DATEOFSERVICE = 1.
<REEX_ACC_DOC_EXT_FI>-HASDIFFOPTRATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REEX_ACC_DOC_EXT_FI-DIFFOPTRATE, sy-vline,
  WA_REEX_ACC_DOC_EXT_FI-NOTAXCORR, sy-vline,
  WA_REEX_ACC_DOC_EXT_FI-SUBSET, sy-vline,
  WA_REEX_ACC_DOC_EXT_FI-CERULE, sy-vline,
  WA_REEX_ACC_DOC_EXT_FI-RECNNR, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_REEX_ACC_DOC_EXT_FI 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_REEX_ACC_DOC_EXT_FI 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_REEX_ACC_DOC_EXT_FI INTO WA_REEX_ACC_DOC_EXT_FI.


*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 RECNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REEX_ACC_DOC_EXT_FI-RECNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REEX_ACC_DOC_EXT_FI-RECNNR.
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_REEX_ACC_DOC_EXT_FI_STR, 
ITEMNO TYPE STRING,
AMTRANSTYPE TYPE STRING,
TCOBJNR TYPE STRING,
DATEOFSERVICE TYPE STRING,
HASDIFFOPTRATE TYPE STRING,
DIFFOPTRATE TYPE STRING,
NOTAXCORR TYPE STRING,
SUBSET TYPE STRING,
CERULE TYPE STRING,
RECNNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REEX_ACC_DOC_EXT_FI_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_REEX_ACC_DOC_EXT_FI_STR-ITEMNO sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-AMTRANSTYPE sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-TCOBJNR sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-DATEOFSERVICE sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-HASDIFFOPTRATE sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-DIFFOPTRATE sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-NOTAXCORR sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-SUBSET sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-CERULE sy-vline 
WA_REEX_ACC_DOC_EXT_FI_STR-RECNNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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