ABAP Select data from SAP table RLMSEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RLMSEG
*  INTO TABLE @DATA(IT_RLMSEG2).
*--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_RLMSEG INDEX 1 INTO DATA(WA_RLMSEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RLMSEG>-MBLNR = 1.
<RLMSEG>-MJAHR = 1.
<RLMSEG>-ZEILE = 1.
<RLMSEG>-BLDAT = 1.
<RLMSEG>-XBLNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RLMSEG-FRBNR, sy-vline,
  WA_RLMSEG-BWART, sy-vline,
  WA_RLMSEG-XAUTO, sy-vline,
  WA_RLMSEG-MATNR, sy-vline,
  WA_RLMSEG-WERKS, sy-vline,
  WA_RLMSEG-SOBKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RLMSEG 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_RLMSEG 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_RLMSEG INTO WA_RLMSEG.


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

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

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

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

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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RLMSEG-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RLMSEG-VBELN.
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_RLMSEG_STR, 
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
BLDAT TYPE STRING,
XBLNR TYPE STRING,
FRBNR TYPE STRING,
BWART TYPE STRING,
XAUTO TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
LLIEF TYPE STRING,
SPDNR TYPE STRING,
SHKZG TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
LFBJA TYPE STRING,
LFBNR TYPE STRING,
LFPOS TYPE STRING,
SJAHR TYPE STRING,
SMBLN TYPE STRING,
SMBLP TYPE STRING,
WEMPF TYPE STRING,
UMWRK TYPE STRING,
BUKRS TYPE STRING,
KZBEW TYPE STRING,
KZVBR TYPE STRING,
KZZUG TYPE STRING,
LSMNG TYPE STRING,
LSMEH TYPE STRING,
URZEI TYPE STRING,
POTYPE TYPE STRING,
ACHOL_KEY TYPE STRING,
KZRAC TYPE STRING,
LFDAT TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RLMSEG_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_RLMSEG_STR-MBLNR sy-vline 
WA_RLMSEG_STR-MJAHR sy-vline 
WA_RLMSEG_STR-ZEILE sy-vline 
WA_RLMSEG_STR-BLDAT sy-vline 
WA_RLMSEG_STR-XBLNR sy-vline 
WA_RLMSEG_STR-FRBNR sy-vline 
WA_RLMSEG_STR-BWART sy-vline 
WA_RLMSEG_STR-XAUTO sy-vline 
WA_RLMSEG_STR-MATNR sy-vline 
WA_RLMSEG_STR-WERKS sy-vline 
WA_RLMSEG_STR-SOBKZ sy-vline 
WA_RLMSEG_STR-LIFNR sy-vline 
WA_RLMSEG_STR-KUNNR sy-vline 
WA_RLMSEG_STR-LLIEF sy-vline 
WA_RLMSEG_STR-SPDNR sy-vline 
WA_RLMSEG_STR-SHKZG sy-vline 
WA_RLMSEG_STR-MENGE sy-vline 
WA_RLMSEG_STR-MEINS sy-vline 
WA_RLMSEG_STR-LFBJA sy-vline 
WA_RLMSEG_STR-LFBNR sy-vline 
WA_RLMSEG_STR-LFPOS sy-vline 
WA_RLMSEG_STR-SJAHR sy-vline 
WA_RLMSEG_STR-SMBLN sy-vline 
WA_RLMSEG_STR-SMBLP sy-vline 
WA_RLMSEG_STR-WEMPF sy-vline 
WA_RLMSEG_STR-UMWRK sy-vline 
WA_RLMSEG_STR-BUKRS sy-vline 
WA_RLMSEG_STR-KZBEW sy-vline 
WA_RLMSEG_STR-KZVBR sy-vline 
WA_RLMSEG_STR-KZZUG sy-vline 
WA_RLMSEG_STR-LSMNG sy-vline 
WA_RLMSEG_STR-LSMEH sy-vline 
WA_RLMSEG_STR-URZEI sy-vline 
WA_RLMSEG_STR-POTYPE sy-vline 
WA_RLMSEG_STR-ACHOL_KEY sy-vline 
WA_RLMSEG_STR-KZRAC sy-vline 
WA_RLMSEG_STR-LFDAT sy-vline 
WA_RLMSEG_STR-VBELN sy-vline 
WA_RLMSEG_STR-VBELP sy-vline      INTO ld_text SEPARATED BY SPACE.

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