ABAP Select data from SAP table MEPO_S_MESSAGES_BAPI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEPO_S_MESSAGES_BAPI
*  INTO TABLE @DATA(IT_MEPO_S_MESSAGES_BAPI2).
*--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_MEPO_S_MESSAGES_BAPI INDEX 1 INTO DATA(WA_MEPO_S_MESSAGES_BAPI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEPO_S_MESSAGES_BAPI>-OBJTYP = 1.
<MEPO_S_MESSAGES_BAPI>-EBELN = 1.
<MEPO_S_MESSAGES_BAPI>-EBELP = 1.
<MEPO_S_MESSAGES_BAPI>-ETENR = 1.
<MEPO_S_MESSAGES_BAPI>-ETENS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEPO_S_MESSAGES_BAPI-ZEKKN, sy-vline,
  WA_MEPO_S_MESSAGES_BAPI-RSPOS, sy-vline,
  WA_MEPO_S_MESSAGES_BAPI-SUPPLIERCONFIRMATION, sy-vline,
  WA_MEPO_S_MESSAGES_BAPI-CONTEXT, sy-vline,
  WA_MEPO_S_MESSAGES_BAPI-METAFIELD, sy-vline,
  WA_MEPO_S_MESSAGES_BAPI-MSGTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEPO_S_MESSAGES_BAPI 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_MEPO_S_MESSAGES_BAPI 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_MEPO_S_MESSAGES_BAPI INTO WA_MEPO_S_MESSAGES_BAPI.


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

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

*Conversion exit ALPHA, internal->external for field SRV_CONTRACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEPO_S_MESSAGES_BAPI-SRV_CONTRACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEPO_S_MESSAGES_BAPI-SRV_CONTRACT.
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_MEPO_S_MESSAGES_BAPI_STR, 
OBJTYP TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENR TYPE STRING,
ETENS TYPE STRING,
ZEKKN TYPE STRING,
RSPOS TYPE STRING,
SUPPLIERCONFIRMATION TYPE STRING,
CONTEXT TYPE STRING,
METAFIELD TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
OBJTXT TYPE STRING,
SRV_ITEMNO TYPE STRING,
SRV_OUTLINE TYPE STRING,
SRV_LINE TYPE STRING,
SRV_SERIAL_NO TYPE STRING,
SRV_CONTRACT TYPE STRING,
SRV_CONTRACT_ITEM TYPE STRING,
SRV_TEXT_TYPE TYPE STRING,
INTROW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEPO_S_MESSAGES_BAPI_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_MEPO_S_MESSAGES_BAPI_STR-OBJTYP sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-EBELN sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-EBELP sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-ETENR sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-ETENS sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-ZEKKN sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-RSPOS sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SUPPLIERCONFIRMATION sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-CONTEXT sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-METAFIELD sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGTY sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGID sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGNO sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGV1 sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGV2 sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGV3 sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-MSGV4 sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-OBJTXT sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_ITEMNO sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_OUTLINE sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_LINE sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_SERIAL_NO sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_CONTRACT sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_CONTRACT_ITEM sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-SRV_TEXT_TYPE sy-vline 
WA_MEPO_S_MESSAGES_BAPI_STR-INTROW sy-vline      INTO ld_text SEPARATED BY SPACE.

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