ABAP Select data from SAP table RESRVDINVITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RESRVDINVITEM
*  INTO TABLE @DATA(IT_RESRVDINVITEM2).
*--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_RESRVDINVITEM INDEX 1 INTO DATA(WA_RESRVDINVITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RESRVDINVITEM>-SRECHNGNR = 1.
<RESRVDINVITEM>-BUKRS = 1.
<RESRVDINVITEM>-DTRANS = 1.
<RESRVDINVITEM>-TTRANS = 1.
<RESRVDINVITEM>-NTRANS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RESRVDINVITEM-GJAHR, sy-vline,
  WA_RESRVDINVITEM-BELNR, sy-vline,
  WA_RESRVDINVITEM-BUZEI, sy-vline,
  WA_RESRVDINVITEM-RANL, sy-vline,
  WA_RESRVDINVITEM-RKLAMMER, sy-vline,
  WA_RESRVDINVITEM-DFAELL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RESRVDINVITEM 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_RESRVDINVITEM 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_RESRVDINVITEM INTO WA_RESRVDINVITEM.


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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field REBZG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RESRVDINVITEM-REBZG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RESRVDINVITEM-REBZG.
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_RESRVDINVITEM_STR, 
SRECHNGNR TYPE STRING,
BUKRS TYPE STRING,
DTRANS TYPE STRING,
TTRANS TYPE STRING,
NTRANS TYPE STRING,
GJAHR TYPE STRING,
BELNR TYPE STRING,
BUZEI TYPE STRING,
RANL TYPE STRING,
RKLAMMER TYPE STRING,
DFAELL TYPE STRING,
RPARTNR TYPE STRING,
RPARTNR_ADR_REF TYPE STRING,
KUNNR TYPE STRING,
RDARNEHM TYPE STRING,
RDARNEHM_ADR_REF TYPE STRING,
HDN_KUNNR TYPE STRING,
ZLSCH TYPE STRING,
SOBJEKT TYPE STRING,
GSART TYPE STRING,
STITART TYPE STRING,
SKOART TYPE STRING,
SBEWART TYPE STRING,
DBERVON TYPE STRING,
DBERBIS TYPE STRING,
SSOLHAB TYPE STRING,
SPLANIST TYPE STRING,
AMMRHY TYPE STRING,
SBWHR TYPE STRING,
BBWHR TYPE STRING,
BBASIS TYPE STRING,
PKOND TYPE STRING,
RBELKPFD TYPE STRING,
RPOSNR TYPE STRING,
REBZJ TYPE STRING,
REBZG TYPE STRING,
REBZZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RESRVDINVITEM_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_RESRVDINVITEM_STR-SRECHNGNR sy-vline 
WA_RESRVDINVITEM_STR-BUKRS sy-vline 
WA_RESRVDINVITEM_STR-DTRANS sy-vline 
WA_RESRVDINVITEM_STR-TTRANS sy-vline 
WA_RESRVDINVITEM_STR-NTRANS sy-vline 
WA_RESRVDINVITEM_STR-GJAHR sy-vline 
WA_RESRVDINVITEM_STR-BELNR sy-vline 
WA_RESRVDINVITEM_STR-BUZEI sy-vline 
WA_RESRVDINVITEM_STR-RANL sy-vline 
WA_RESRVDINVITEM_STR-RKLAMMER sy-vline 
WA_RESRVDINVITEM_STR-DFAELL sy-vline 
WA_RESRVDINVITEM_STR-RPARTNR sy-vline 
WA_RESRVDINVITEM_STR-RPARTNR_ADR_REF sy-vline 
WA_RESRVDINVITEM_STR-KUNNR sy-vline 
WA_RESRVDINVITEM_STR-RDARNEHM sy-vline 
WA_RESRVDINVITEM_STR-RDARNEHM_ADR_REF sy-vline 
WA_RESRVDINVITEM_STR-HDN_KUNNR sy-vline 
WA_RESRVDINVITEM_STR-ZLSCH sy-vline 
WA_RESRVDINVITEM_STR-SOBJEKT sy-vline 
WA_RESRVDINVITEM_STR-GSART sy-vline 
WA_RESRVDINVITEM_STR-STITART sy-vline 
WA_RESRVDINVITEM_STR-SKOART sy-vline 
WA_RESRVDINVITEM_STR-SBEWART sy-vline 
WA_RESRVDINVITEM_STR-DBERVON sy-vline 
WA_RESRVDINVITEM_STR-DBERBIS sy-vline 
WA_RESRVDINVITEM_STR-SSOLHAB sy-vline 
WA_RESRVDINVITEM_STR-SPLANIST sy-vline 
WA_RESRVDINVITEM_STR-AMMRHY sy-vline 
WA_RESRVDINVITEM_STR-SBWHR sy-vline 
WA_RESRVDINVITEM_STR-BBWHR sy-vline 
WA_RESRVDINVITEM_STR-BBASIS sy-vline 
WA_RESRVDINVITEM_STR-PKOND sy-vline 
WA_RESRVDINVITEM_STR-RBELKPFD sy-vline 
WA_RESRVDINVITEM_STR-RPOSNR sy-vline 
WA_RESRVDINVITEM_STR-REBZJ sy-vline 
WA_RESRVDINVITEM_STR-REBZG sy-vline 
WA_RESRVDINVITEM_STR-REBZZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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