ABAP Select data from SAP table MRER_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRER_ITEM
*  INTO TABLE @DATA(IT_MRER_ITEM2).
*--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_MRER_ITEM INDEX 1 INTO DATA(WA_MRER_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRER_ITEM>-EBELN = 1.
<MRER_ITEM>-EBELP = 1.
<MRER_ITEM>-GJAHR = 1.
<MRER_ITEM>-BELNR = 1.
<MRER_ITEM>-BUZEI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRER_ITEM-SHKZG, sy-vline,
  WA_MRER_ITEM-LIGHTS, sy-vline,
  WA_MRER_ITEM-STATUS, sy-vline,
  WA_MRER_ITEM-ICON, sy-vline,
  WA_MRER_ITEM-LOG_HANDLE, sy-vline,
  WA_MRER_ITEM-BLOCK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRER_ITEM 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_MRER_ITEM 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_MRER_ITEM INTO WA_MRER_ITEM.


*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_MRER_ITEM-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MRER_ITEM-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-GJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MRER_ITEM-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-LFGJA.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field REBZJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MRER_ITEM-REBZJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-REBZJ.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field RGJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MRER_ITEM-RGJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-RGJAHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field SJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MRER_ITEM-SJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-SJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SMBLN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRER_ITEM-SMBLN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRER_ITEM-SMBLN.
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_MRER_ITEM_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
GJAHR TYPE STRING,
BELNR TYPE STRING,
BUZEI TYPE STRING,
SHKZG TYPE STRING,
LIGHTS TYPE STRING,
STATUS TYPE STRING,
ICON TYPE STRING,
LOG_HANDLE TYPE STRING,
BLOCK TYPE STRING,
XBLNR TYPE STRING,
BUDAT TYPE STRING,
LSDAT TYPE STRING,
ZFBDT TYPE STRING,
PRDAT TYPE STRING,
BWART TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
BPMNG TYPE STRING,
BPRME TYPE STRING,
NETWR TYPE STRING,
KNUMV TYPE STRING,
KPOSN TYPE STRING,
AUFWR TYPE STRING,
WAERS TYPE STRING,
MWSKZ TYPE STRING,
LFGJA TYPE STRING,
LFBNR TYPE STRING,
LFPOS TYPE STRING,
REBZJ TYPE STRING,
REBZG TYPE STRING,
SPTYP TYPE STRING,
HSCKZ TYPE STRING,
RGJAHR TYPE STRING,
RBELNR TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
SJAHR TYPE STRING,
SMBLN TYPE STRING,
SMBLP TYPE STRING,
ZBD1T TYPE STRING,
ZBD1P TYPE STRING,
ZBD2T TYPE STRING,
ZBD2P TYPE STRING,
ZBD3T TYPE STRING,
ZLSPR TYPE STRING,
ZLSCH TYPE STRING,
ERSBAI TYPE STRING,
PACKNO TYPE STRING,
INTROW TYPE STRING,
STCEG TYPE STRING,
TEXT TYPE STRING,
SELFL TYPE STRING,
SPACE_1 TYPE STRING,
SPACE_2 TYPE STRING,
SPACE_3 TYPE STRING,
SPACE_4 TYPE STRING,
EKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRER_ITEM_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_MRER_ITEM_STR-EBELN sy-vline 
WA_MRER_ITEM_STR-EBELP sy-vline 
WA_MRER_ITEM_STR-GJAHR sy-vline 
WA_MRER_ITEM_STR-BELNR sy-vline 
WA_MRER_ITEM_STR-BUZEI sy-vline 
WA_MRER_ITEM_STR-SHKZG sy-vline 
WA_MRER_ITEM_STR-LIGHTS sy-vline 
WA_MRER_ITEM_STR-STATUS sy-vline 
WA_MRER_ITEM_STR-ICON sy-vline 
WA_MRER_ITEM_STR-LOG_HANDLE sy-vline 
WA_MRER_ITEM_STR-BLOCK sy-vline 
WA_MRER_ITEM_STR-XBLNR sy-vline 
WA_MRER_ITEM_STR-BUDAT sy-vline 
WA_MRER_ITEM_STR-LSDAT sy-vline 
WA_MRER_ITEM_STR-ZFBDT sy-vline 
WA_MRER_ITEM_STR-PRDAT sy-vline 
WA_MRER_ITEM_STR-BWART sy-vline 
WA_MRER_ITEM_STR-MENGE sy-vline 
WA_MRER_ITEM_STR-MEINS sy-vline 
WA_MRER_ITEM_STR-BPMNG sy-vline 
WA_MRER_ITEM_STR-BPRME sy-vline 
WA_MRER_ITEM_STR-NETWR sy-vline 
WA_MRER_ITEM_STR-KNUMV sy-vline 
WA_MRER_ITEM_STR-KPOSN sy-vline 
WA_MRER_ITEM_STR-AUFWR sy-vline 
WA_MRER_ITEM_STR-WAERS sy-vline 
WA_MRER_ITEM_STR-MWSKZ sy-vline 
WA_MRER_ITEM_STR-LFGJA sy-vline 
WA_MRER_ITEM_STR-LFBNR sy-vline 
WA_MRER_ITEM_STR-LFPOS sy-vline 
WA_MRER_ITEM_STR-REBZJ sy-vline 
WA_MRER_ITEM_STR-REBZG sy-vline 
WA_MRER_ITEM_STR-SPTYP sy-vline 
WA_MRER_ITEM_STR-HSCKZ sy-vline 
WA_MRER_ITEM_STR-RGJAHR sy-vline 
WA_MRER_ITEM_STR-RBELNR sy-vline 
WA_MRER_ITEM_STR-CPUDT sy-vline 
WA_MRER_ITEM_STR-CPUTM sy-vline 
WA_MRER_ITEM_STR-SJAHR sy-vline 
WA_MRER_ITEM_STR-SMBLN sy-vline 
WA_MRER_ITEM_STR-SMBLP sy-vline 
WA_MRER_ITEM_STR-ZBD1T sy-vline 
WA_MRER_ITEM_STR-ZBD1P sy-vline 
WA_MRER_ITEM_STR-ZBD2T sy-vline 
WA_MRER_ITEM_STR-ZBD2P sy-vline 
WA_MRER_ITEM_STR-ZBD3T sy-vline 
WA_MRER_ITEM_STR-ZLSPR sy-vline 
WA_MRER_ITEM_STR-ZLSCH sy-vline 
WA_MRER_ITEM_STR-ERSBAI sy-vline 
WA_MRER_ITEM_STR-PACKNO sy-vline 
WA_MRER_ITEM_STR-INTROW sy-vline 
WA_MRER_ITEM_STR-STCEG sy-vline 
WA_MRER_ITEM_STR-TEXT sy-vline 
WA_MRER_ITEM_STR-SELFL sy-vline 
WA_MRER_ITEM_STR-SPACE_1 sy-vline 
WA_MRER_ITEM_STR-SPACE_2 sy-vline 
WA_MRER_ITEM_STR-SPACE_3 sy-vline 
WA_MRER_ITEM_STR-SPACE_4 sy-vline 
WA_MRER_ITEM_STR-EKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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