ABAP Select data from SAP table N2M_ITEM_QUANS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP N2M_ITEM_QUANS 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 N2M_ITEM_QUANS.

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 N2M_ITEM_QUANS 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_N2M_ITEM_QUANS TYPE STANDARD TABLE OF N2M_ITEM_QUANS,
      WA_N2M_ITEM_QUANS TYPE N2M_ITEM_QUANS,
      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: <N2M_ITEM_QUANS> TYPE N2M_ITEM_QUANS.


*Original SAP ECC Select statement 
SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM N2M_ITEM_QUANS
  INTO TABLE IT_N2M_ITEM_QUANS.

*Select data and declare internal table using  in-line method @DATA 
SELECT *
  FROM N2M_ITEM_QUANS
  INTO TABLE @DATA(IT_N2M_ITEM_QUANS2).

*You can also declare the header/work area using the  in-line DATA declaration method 
READ TABLE IT_N2M_ITEM_QUANS INDEX 1 INTO DATA(WA_N2M_ITEM_QUANS2).


*Latest ABAP cloud SELECT statement using the FIELDS syntax. But note to following the clean core principles you should not select directly from an SAP table 
* and should instead use a CDS view or create you own CDS and use that.
SELECT FROM N2M_ITEM_QUANS
  FIELDS *
*  WHERE would go here
  INTO TABLE @DATA(IT_N2M_ITEM_QUANS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_N2M_ITEM_QUANS ASSIGNING <N2M_ITEM_QUANS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<N2M_ITEM_QUANS>-MANDT = 1.
<N2M_ITEM_QUANS>-DOC_TYPE = 1.
<N2M_ITEM_QUANS>-DOCUMENT = 1.
<N2M_ITEM_QUANS>-ITEM = 1.
<N2M_ITEM_QUANS>-SUB_ITEM = 1.

ENDLOOP.

LOOP AT IT_N2M_ITEM_QUANS INTO WA_N2M_ITEM_QUANS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_N2M_ITEM_QUANS-MATNR, sy-vline,
  WA_N2M_ITEM_QUANS-CHARG, sy-vline,
  WA_N2M_ITEM_QUANS-COMPLETE_QUAN, sy-vline,
  WA_N2M_ITEM_QUANS-COMPLETE_QUAN_SONS, sy-vline,
  WA_N2M_ITEM_QUANS-POSITION_QUAN, sy-vline,
  WA_N2M_ITEM_QUANS-ASSOC_QUAN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_N2M_ITEM_QUANS 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_N2M_ITEM_QUANS 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_N2M_ITEM_QUANS INTO WA_N2M_ITEM_QUANS.


*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 DOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_N2M_ITEM_QUANS-DOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_N2M_ITEM_QUANS-DOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_N2M_ITEM_QUANS-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_N2M_ITEM_QUANS-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_OF_QUAN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_N2M_ITEM_QUANS-UNIT_OF_QUAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_N2M_ITEM_QUANS-UNIT_OF_QUAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_DOC
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_N2M_ITEM_QUANS-UNIT_DOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_N2M_ITEM_QUANS-UNIT_DOC.
WRITE:/ 'New Value:', ld_input.
ENDFORM.