ABAP Select data from SAP table RNLES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLES
*  INTO TABLE @DATA(IT_RNLES2).
*--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_RNLES INDEX 1 INTO DATA(WA_RNLES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLES>-LEIST = 1.
<RNLES>-LEVON = 1.
<RNLES>-LEBIS = 1.
<RNLES>-LEIID = 1.
<RNLES>-KOSTR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLES-UDATV, sy-vline,
  WA_RNLES-UDATB, sy-vline,
  WA_RNLES-LEINR, sy-vline,
  WA_RNLES-BEGDT, sy-vline,
  WA_RNLES-ENDDT, sy-vline,
  WA_RNLES-ERBOE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLES 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_RNLES 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_RNLES INTO WA_RNLES.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RNLES_STR, 
LEIST TYPE STRING,
LEVON TYPE STRING,
LEBIS TYPE STRING,
LEIID TYPE STRING,
KOSTR TYPE STRING,
UDATV TYPE STRING,
UDATB TYPE STRING,
LEINR TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
ERBOE TYPE STRING,
ANFOE TYPE STRING,
LNRIC TYPE STRING,
ICPML TYPE STRING,
OPART TYPE STRING,
DRG_SEQNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLES_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_RNLES_STR-LEIST sy-vline 
WA_RNLES_STR-LEVON sy-vline 
WA_RNLES_STR-LEBIS sy-vline 
WA_RNLES_STR-LEIID sy-vline 
WA_RNLES_STR-KOSTR sy-vline 
WA_RNLES_STR-UDATV sy-vline 
WA_RNLES_STR-UDATB sy-vline 
WA_RNLES_STR-LEINR sy-vline 
WA_RNLES_STR-BEGDT sy-vline 
WA_RNLES_STR-ENDDT sy-vline 
WA_RNLES_STR-ERBOE sy-vline 
WA_RNLES_STR-ANFOE sy-vline 
WA_RNLES_STR-LNRIC sy-vline 
WA_RNLES_STR-ICPML sy-vline 
WA_RNLES_STR-OPART sy-vline 
WA_RNLES_STR-DRG_SEQNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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