ABAP Select data from SAP table RMCS0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMCS0 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 RMCS0. 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 RMCS0 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_RMCS0 TYPE STANDARD TABLE OF RMCS0,
      WA_RMCS0 TYPE RMCS0,
      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: <RMCS0> TYPE RMCS0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMCS0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMCS0
  INTO TABLE IT_RMCS0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMCS0
*  INTO TABLE @DATA(IT_RMCS02).
*--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_RMCS0 INDEX 1 INTO DATA(WA_RMCS02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMCS0 ASSIGNING <RMCS0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMCS0>-MMSPB = 1.
<RMCS0>-KZSPB = 1.
<RMCS0>-ANZHL = 1.
<RMCS0>-GKENN = 1.
<RMCS0>-AWAER1 = 1.

ENDLOOP.

LOOP AT IT_RMCS0 INTO WA_RMCS0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMCS0-AWAER2, sy-vline,
  WA_RMCS0-MSELP, sy-vline,
  WA_RMCS0-OSELP, sy-vline,
  WA_RMCS0-KURST, sy-vline,
  WA_RMCS0-CB_OPTKO, sy-vline,
  WA_RMCS0-CB_OPTSK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMCS0 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_RMCS0 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_RMCS0 INTO WA_RMCS0.


*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 JAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RMCS0-JAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCS0-JAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI, internal->external for field QUAR
CALL FUNCTION 'CONVERSION_EXIT_PERI_OUTPUT'
  EXPORTING
    input =                      WA_RMCS0-QUAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCS0-QUAR.
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_RMCS0_STR, 
MMSPB TYPE STRING,
KZSPB TYPE STRING,
ANZHL TYPE STRING,
GKENN TYPE STRING,
AWAER1 TYPE STRING,
AWAER2 TYPE STRING,
MSELP TYPE STRING,
OSELP TYPE STRING,
KURST TYPE STRING,
CB_OPTKO TYPE STRING,
CB_OPTSK TYPE STRING,
UMDAT TYPE STRING,
DATUM_KH TYPE STRING,
JAHR TYPE STRING,
QUAR TYPE STRING,
TEXT10 TYPE STRING,
TEXT20 TYPE STRING,
TEXT30 TYPE STRING,
TEXT40 TYPE STRING,
TEXT50 TYPE STRING,
TEXT60 TYPE STRING,
HNODE TYPE STRING,
VRSIO TYPE STRING,
FLGGSA TYPE STRING,
FLGASEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMCS0_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_RMCS0_STR-MMSPB sy-vline 
WA_RMCS0_STR-KZSPB sy-vline 
WA_RMCS0_STR-ANZHL sy-vline 
WA_RMCS0_STR-GKENN sy-vline 
WA_RMCS0_STR-AWAER1 sy-vline 
WA_RMCS0_STR-AWAER2 sy-vline 
WA_RMCS0_STR-MSELP sy-vline 
WA_RMCS0_STR-OSELP sy-vline 
WA_RMCS0_STR-KURST sy-vline 
WA_RMCS0_STR-CB_OPTKO sy-vline 
WA_RMCS0_STR-CB_OPTSK sy-vline 
WA_RMCS0_STR-UMDAT sy-vline 
WA_RMCS0_STR-DATUM_KH sy-vline 
WA_RMCS0_STR-JAHR sy-vline 
WA_RMCS0_STR-QUAR sy-vline 
WA_RMCS0_STR-TEXT10 sy-vline 
WA_RMCS0_STR-TEXT20 sy-vline 
WA_RMCS0_STR-TEXT30 sy-vline 
WA_RMCS0_STR-TEXT40 sy-vline 
WA_RMCS0_STR-TEXT50 sy-vline 
WA_RMCS0_STR-TEXT60 sy-vline 
WA_RMCS0_STR-HNODE sy-vline 
WA_RMCS0_STR-VRSIO sy-vline 
WA_RMCS0_STR-FLGGSA sy-vline 
WA_RMCS0_STR-FLGASEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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