ABAP Select data from SAP table BAPIAAHDR into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPIAAHDR
*  INTO TABLE @DATA(IT_BAPIAAHDR2).
*--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_BAPIAAHDR INDEX 1 INTO DATA(WA_BAPIAAHDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPIAAHDR>-CO_AREA = 1.
<BAPIAAHDR>-DOCDATE = 1.
<BAPIAAHDR>-POSTGDATE = 1.
<BAPIAAHDR>-VERSION = 1.
<BAPIAAHDR>-DOC_NO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPIAAHDR-VARIANT, sy-vline,
  WA_BAPIAAHDR-DOC_HDR_TX, sy-vline,
  WA_BAPIAAHDR-USERNAME, sy-vline,
  WA_BAPIAAHDR-OBJ_KEY, sy-vline,
  WA_BAPIAAHDR-OBJ_TYPE, sy-vline,
  WA_BAPIAAHDR-OBJ_SYS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPIAAHDR 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_BAPIAAHDR 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_BAPIAAHDR INTO WA_BAPIAAHDR.


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

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

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

*Conversion exit GJAHR, internal->external for field VAL_FISYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_BAPIAAHDR-VAL_FISYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIAAHDR-VAL_FISYEAR.
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_BAPIAAHDR_STR, 
CO_AREA TYPE STRING,
DOCDATE TYPE STRING,
POSTGDATE TYPE STRING,
VERSION TYPE STRING,
DOC_NO TYPE STRING,
VARIANT TYPE STRING,
DOC_HDR_TX TYPE STRING,
USERNAME TYPE STRING,
OBJ_KEY TYPE STRING,
OBJ_TYPE TYPE STRING,
OBJ_SYS TYPE STRING,
VAL_PERIOD TYPE STRING,
VAL_FISYEAR TYPE STRING,
DOC_TYPE TYPE STRING,
VALUEDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPIAAHDR_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_BAPIAAHDR_STR-CO_AREA sy-vline 
WA_BAPIAAHDR_STR-DOCDATE sy-vline 
WA_BAPIAAHDR_STR-POSTGDATE sy-vline 
WA_BAPIAAHDR_STR-VERSION sy-vline 
WA_BAPIAAHDR_STR-DOC_NO sy-vline 
WA_BAPIAAHDR_STR-VARIANT sy-vline 
WA_BAPIAAHDR_STR-DOC_HDR_TX sy-vline 
WA_BAPIAAHDR_STR-USERNAME sy-vline 
WA_BAPIAAHDR_STR-OBJ_KEY sy-vline 
WA_BAPIAAHDR_STR-OBJ_TYPE sy-vline 
WA_BAPIAAHDR_STR-OBJ_SYS sy-vline 
WA_BAPIAAHDR_STR-VAL_PERIOD sy-vline 
WA_BAPIAAHDR_STR-VAL_FISYEAR sy-vline 
WA_BAPIAAHDR_STR-DOC_TYPE sy-vline 
WA_BAPIAAHDR_STR-VALUEDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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