ABAP Select data from SAP table A4AN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP A4AN 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 A4AN. 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 A4AN 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_A4AN TYPE STANDARD TABLE OF A4AN,
      WA_A4AN TYPE A4AN,
      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: <A4AN> TYPE A4AN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_A4AN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM A4AN
  INTO TABLE IT_A4AN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM A4AN
*  INTO TABLE @DATA(IT_A4AN2).
*--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_A4AN INDEX 1 INTO DATA(WA_A4AN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_A4AN ASSIGNING <A4AN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<A4AN>-MANDT = 1.
<A4AN>-KAPPL = 1.
<A4AN>-KSCHL = 1.
<A4AN>-COCO_NUM = 1.
<A4AN>-MVGR1 = 1.

ENDLOOP.

LOOP AT IT_A4AN INTO WA_A4AN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_A4AN-MVGR2, sy-vline,
  WA_A4AN-MVGR3, sy-vline,
  WA_A4AN-MVGR4, sy-vline,
  WA_A4AN-MVGR5, sy-vline,
  WA_A4AN-KFRST, sy-vline,
  WA_A4AN-DATBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_A4AN 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_A4AN 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_A4AN INTO WA_A4AN.


*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 COCO_NUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_A4AN-COCO_NUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A4AN-COCO_NUM.
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_A4AN_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
COCO_NUM TYPE STRING,
MVGR1 TYPE STRING,
MVGR2 TYPE STRING,
MVGR3 TYPE STRING,
MVGR4 TYPE STRING,
MVGR5 TYPE STRING,
KFRST TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KBSTAT TYPE STRING,
KNUMH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_A4AN_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_A4AN_STR-MANDT sy-vline 
WA_A4AN_STR-KAPPL sy-vline 
WA_A4AN_STR-KSCHL sy-vline 
WA_A4AN_STR-COCO_NUM sy-vline 
WA_A4AN_STR-MVGR1 sy-vline 
WA_A4AN_STR-MVGR2 sy-vline 
WA_A4AN_STR-MVGR3 sy-vline 
WA_A4AN_STR-MVGR4 sy-vline 
WA_A4AN_STR-MVGR5 sy-vline 
WA_A4AN_STR-KFRST sy-vline 
WA_A4AN_STR-DATBI sy-vline 
WA_A4AN_STR-DATAB sy-vline 
WA_A4AN_STR-KBSTAT sy-vline 
WA_A4AN_STR-KNUMH sy-vline      INTO ld_text SEPARATED BY SPACE.

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