ABAP Select data from SAP table RFC_ALLOC_ITEM_IN_50 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_50 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_50. 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_50 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_50 TYPE STANDARD TABLE OF RFC_ALLOC_ITEM_IN_50,
      WA_RFC_ALLOC_ITEM_IN_50 TYPE RFC_ALLOC_ITEM_IN_50,
      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_50> TYPE RFC_ALLOC_ITEM_IN_50.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFC_ALLOC_ITEM_IN_50.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFC_ALLOC_ITEM_IN_50
  INTO TABLE IT_RFC_ALLOC_ITEM_IN_50.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFC_ALLOC_ITEM_IN_50
*  INTO TABLE @DATA(IT_RFC_ALLOC_ITEM_IN_502).
*--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_50 INDEX 1 INTO DATA(WA_RFC_ALLOC_ITEM_IN_502).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFC_ALLOC_ITEM_IN_50 ASSIGNING <RFC_ALLOC_ITEM_IN_50>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFC_ALLOC_ITEM_IN_50>-SAMMG = 1.
<RFC_ALLOC_ITEM_IN_50>-ABELP = 1.
<RFC_ALLOC_ITEM_IN_50>-APSTP = 1.
<RFC_ALLOC_ITEM_IN_50>-AAVIT = 1.
<RFC_ALLOC_ITEM_IN_50>-VZWRK = 1.

ENDLOOP.

LOOP AT IT_RFC_ALLOC_ITEM_IN_50 INTO WA_RFC_ALLOC_ITEM_IN_50.
*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_50-MATNR, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_50-WEDAT, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_50-AUFME, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_50-ATTYP, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_50-MATKL, sy-vline,
  WA_RFC_ALLOC_ITEM_IN_50-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFC_ALLOC_ITEM_IN_50 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_50 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_50 INTO WA_RFC_ALLOC_ITEM_IN_50.


*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_50-SAMMG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-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_50-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-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_50-AUFME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-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_50-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_50-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_50-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-VBELN.
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_50-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-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_50-SALESMATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-SALESMATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFC_ALLOC_ITEM_IN_50-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFC_ALLOC_ITEM_IN_50-LIFNR.
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_50_STR, 
SAMMG TYPE STRING,
ABELP TYPE STRING,
APSTP TYPE STRING,
AAVIT TYPE STRING,
VZWRK TYPE STRING,
MATNR TYPE STRING,
WEDAT TYPE STRING,
AUFME TYPE STRING,
ATTYP TYPE STRING,
MATKL TYPE STRING,
MEINS TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
AKTNR TYPE STRING,
SALESMATNR TYPE STRING,
MAKTX TYPE STRING,
LIFNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFC_ALLOC_ITEM_IN_50_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_50_STR-SAMMG sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-ABELP sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-APSTP sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-AAVIT sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-VZWRK sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-MATNR sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-WEDAT sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-AUFME sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-ATTYP sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-MATKL sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-MEINS sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-EBELN sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-EBELP sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-VBELN sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-VBELP sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-AKTNR sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-SALESMATNR sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-MAKTX sy-vline 
WA_RFC_ALLOC_ITEM_IN_50_STR-LIFNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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