ABAP Select data from SAP table RFC_ALLOC_ITEM_IN_20 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFC_ALLOC_ITEM_IN_20 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 RFC_ALLOC_ITEM_IN_20. 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 RFC_ALLOC_ITEM_IN_20 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_RFC_ALLOC_ITEM_IN_20 TYPE STANDARD TABLE OF RFC_ALLOC_ITEM_IN_20,
      WA_RFC_ALLOC_ITEM_IN_20 TYPE RFC_ALLOC_ITEM_IN_20,
      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: <RFC_ALLOC_ITEM_IN_20> TYPE RFC_ALLOC_ITEM_IN_20.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFC_ALLOC_ITEM_IN_20.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFC_ALLOC_ITEM_IN_20
  INTO TABLE IT_RFC_ALLOC_ITEM_IN_20.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFC_ALLOC_ITEM_IN_20
*  INTO TABLE @DATA(IT_RFC_ALLOC_ITEM_IN_202).
*--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_RFC_ALLOC_ITEM_IN_20 INDEX 1 INTO DATA(WA_RFC_ALLOC_ITEM_IN_202).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFC_ALLOC_ITEM_IN_20 ASSIGNING <RFC_ALLOC_ITEM_IN_20>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFC_ALLOC_ITEM_IN_20>-SAMMG = 1.
<RFC_ALLOC_ITEM_IN_20>-ABELP = 1.
<RFC_ALLOC_ITEM_IN_20>-VZWRK = 1.
<RFC_ALLOC_ITEM_IN_20>-MATNR = 1.
<RFC_ALLOC_ITEM_IN_20>-WEDAT = 1.

ENDLOOP.

LOOP AT IT_RFC_ALLOC_ITEM_IN_20 INTO WA_RFC_ALLOC_ITEM_IN_20.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFC_ALLOC_ITEM_IN_20-AUFME, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_20-ATTYP, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_20-MATKL, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_20-MEINS, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_20-REF_TYPE, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_20-REF_DOC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFC_ALLOC_ITEM_IN_20 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_RFC_ALLOC_ITEM_IN_20 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_RFC_ALLOC_ITEM_IN_20 INTO WA_RFC_ALLOC_ITEM_IN_20.


*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 SAMMG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_20-SAMMG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_20-SAMMG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_20-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_20-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field AUFME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_20-AUFME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_20-AUFME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_20-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_20-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_20-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_20-AKTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SALESMATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_20-SALESMATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_20-SALESMATNR.
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_RFC_ALLOC_ITEM_IN_20_STR, 
SAMMG TYPE STRING,
ABELP TYPE STRING,
VZWRK TYPE STRING,
MATNR TYPE STRING,
WEDAT TYPE STRING,
AUFME TYPE STRING,
ATTYP TYPE STRING,
MATKL TYPE STRING,
MEINS TYPE STRING,
REF_TYPE TYPE STRING,
REF_DOC TYPE STRING,
REF_ITEM TYPE STRING,
REF_DLVDT TYPE STRING,
AKTNR TYPE STRING,
SALESMATNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFC_ALLOC_ITEM_IN_20_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_RFC_ALLOC_ITEM_IN_20_STR-SAMMG sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-ABELP sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-VZWRK sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-MATNR sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-WEDAT sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-AUFME sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-ATTYP sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-MATKL sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-MEINS sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-REF_TYPE sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-REF_DOC sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-REF_ITEM sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-REF_DLVDT sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-AKTNR sy-vline 
WA_RFC_ALLOC_ITEM_IN_20_STR-SALESMATNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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