ABAP Select data from SAP table IRESVNDOCITM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IRESVNDOCITM
*  INTO TABLE @DATA(IT_IRESVNDOCITM2).
*--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_IRESVNDOCITM INDEX 1 INTO DATA(WA_IRESVNDOCITM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IRESVNDOCITM>-MANDT = 1.
<IRESVNDOCITM>-RESERVATION = 1.
<IRESVNDOCITM>-RESERVATIONITEM = 1.
<IRESVNDOCITM>-RECORDTYPE = 1.
<IRESVNDOCITM>-PLANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IRESVNDOCITM-STORAGELOCATION, sy-vline,
  WA_IRESVNDOCITM-PRODUCT, sy-vline,
  WA_IRESVNDOCITM-BATCH, sy-vline,
  WA_IRESVNDOCITM-INVENTORYSPECIALSTOCKTYPE, sy-vline,
  WA_IRESVNDOCITM-GOODSMOVEMENTTYPE, sy-vline,
  WA_IRESVNDOCITM-REQUIREMENTTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IRESVNDOCITM 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_IRESVNDOCITM 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_IRESVNDOCITM INTO WA_IRESVNDOCITM.


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

*Conversion exit NUMCV, internal->external for field MANUFACTURINGORDEROPERATION
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_IRESVNDOCITM-MANUFACTURINGORDEROPERATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IRESVNDOCITM-MANUFACTURINGORDEROPERATION.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field RESVNITMSRVCDOCASACCTASGT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IRESVNDOCITM-RESVNITMSRVCDOCASACCTASGT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IRESVNDOCITM-RESVNITMSRVCDOCASACCTASGT.
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_IRESVNDOCITM_STR, 
MANDT TYPE STRING,
RESERVATION TYPE STRING,
RESERVATIONITEM TYPE STRING,
RECORDTYPE TYPE STRING,
PLANT TYPE STRING,
STORAGELOCATION TYPE STRING,
PRODUCT TYPE STRING,
BATCH TYPE STRING,
INVENTORYSPECIALSTOCKTYPE TYPE STRING,
GOODSMOVEMENTTYPE TYPE STRING,
REQUIREMENTTYPE TYPE STRING,
RESERVATIONITEMCREATIONCODE TYPE STRING,
MATLCOMPREQUIREMENTDATE TYPE STRING,
MANUFACTURINGORDEROPERATION TYPE STRING,
GOODSMOVEMENTISALLOWED TYPE STRING,
DEBITCREDITCODE TYPE STRING,
BASEUNIT TYPE STRING,
GLACCOUNT TYPE STRING,
RESVNACCOUNTISENTEREDMANUALLY TYPE STRING,
ENTRYUNIT TYPE STRING,
QUANTITYISFIXED TYPE STRING,
COMPANYCODECURRENCY TYPE STRING,
ISSUINGORRECEIVINGPLANT TYPE STRING,
ISSUINGORRECEIVINGSTORAGELOC TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGDOCUMENTITEM TYPE STRING,
RESVNITMREQUIREDQTYINBASEUNIT TYPE STRING,
CONFDQTYFORATPINBASEUOM TYPE STRING,
RESERVATIONITEMISFINALLYISSUED TYPE STRING,
RESERVATIONITMISMARKEDFORDELTN TYPE STRING,
RESVNITMREQUIREDQTYINENTRYUNIT TYPE STRING,
RESVNITMWITHDRAWNQTYINBASEUNIT TYPE STRING,
RESVNITMWITHDRAWNAMTINCCCRCY TYPE STRING,
SUPPLIER TYPE STRING,
MATERIALGROUP TYPE STRING,
GOODSRECIPIENTNAME TYPE STRING,
UNLOADINGPOINTNAME TYPE STRING,
RESERVATIONITEMTEXT TYPE STRING,
RECIPIENTLOCATIONCODE TYPE STRING,
SERVICEOBJECTTYPE TYPE STRING,
SERVICEDOCUMENT TYPE STRING,
SERVICEDOCUMENTITEM TYPE STRING,
RESVNITMSRVCDOCTYPEASACCTASGT TYPE STRING,
RESVNITMSRVCDOCASACCTASGT TYPE STRING,
RESVNITMSRVCDOCITMASACCTASGT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IRESVNDOCITM_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_IRESVNDOCITM_STR-MANDT sy-vline 
WA_IRESVNDOCITM_STR-RESERVATION sy-vline 
WA_IRESVNDOCITM_STR-RESERVATIONITEM sy-vline 
WA_IRESVNDOCITM_STR-RECORDTYPE sy-vline 
WA_IRESVNDOCITM_STR-PLANT sy-vline 
WA_IRESVNDOCITM_STR-STORAGELOCATION sy-vline 
WA_IRESVNDOCITM_STR-PRODUCT sy-vline 
WA_IRESVNDOCITM_STR-BATCH sy-vline 
WA_IRESVNDOCITM_STR-INVENTORYSPECIALSTOCKTYPE sy-vline 
WA_IRESVNDOCITM_STR-GOODSMOVEMENTTYPE sy-vline 
WA_IRESVNDOCITM_STR-REQUIREMENTTYPE sy-vline 
WA_IRESVNDOCITM_STR-RESERVATIONITEMCREATIONCODE sy-vline 
WA_IRESVNDOCITM_STR-MATLCOMPREQUIREMENTDATE sy-vline 
WA_IRESVNDOCITM_STR-MANUFACTURINGORDEROPERATION sy-vline 
WA_IRESVNDOCITM_STR-GOODSMOVEMENTISALLOWED sy-vline 
WA_IRESVNDOCITM_STR-DEBITCREDITCODE sy-vline 
WA_IRESVNDOCITM_STR-BASEUNIT sy-vline 
WA_IRESVNDOCITM_STR-GLACCOUNT sy-vline 
WA_IRESVNDOCITM_STR-RESVNACCOUNTISENTEREDMANUALLY sy-vline 
WA_IRESVNDOCITM_STR-ENTRYUNIT sy-vline 
WA_IRESVNDOCITM_STR-QUANTITYISFIXED sy-vline 
WA_IRESVNDOCITM_STR-COMPANYCODECURRENCY sy-vline 
WA_IRESVNDOCITM_STR-ISSUINGORRECEIVINGPLANT sy-vline 
WA_IRESVNDOCITM_STR-ISSUINGORRECEIVINGSTORAGELOC sy-vline 
WA_IRESVNDOCITM_STR-PURCHASINGDOCUMENT sy-vline 
WA_IRESVNDOCITM_STR-PURCHASINGDOCUMENTITEM sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMREQUIREDQTYINBASEUNIT sy-vline 
WA_IRESVNDOCITM_STR-CONFDQTYFORATPINBASEUOM sy-vline 
WA_IRESVNDOCITM_STR-RESERVATIONITEMISFINALLYISSUED sy-vline 
WA_IRESVNDOCITM_STR-RESERVATIONITMISMARKEDFORDELTN sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMREQUIREDQTYINENTRYUNIT sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMWITHDRAWNQTYINBASEUNIT sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMWITHDRAWNAMTINCCCRCY sy-vline 
WA_IRESVNDOCITM_STR-SUPPLIER sy-vline 
WA_IRESVNDOCITM_STR-MATERIALGROUP sy-vline 
WA_IRESVNDOCITM_STR-GOODSRECIPIENTNAME sy-vline 
WA_IRESVNDOCITM_STR-UNLOADINGPOINTNAME sy-vline 
WA_IRESVNDOCITM_STR-RESERVATIONITEMTEXT sy-vline 
WA_IRESVNDOCITM_STR-RECIPIENTLOCATIONCODE sy-vline 
WA_IRESVNDOCITM_STR-SERVICEOBJECTTYPE sy-vline 
WA_IRESVNDOCITM_STR-SERVICEDOCUMENT sy-vline 
WA_IRESVNDOCITM_STR-SERVICEDOCUMENTITEM sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMSRVCDOCTYPEASACCTASGT sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMSRVCDOCASACCTASGT sy-vline 
WA_IRESVNDOCITM_STR-RESVNITMSRVCDOCITMASACCTASGT sy-vline      INTO ld_text SEPARATED BY SPACE.

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