ABAP Select data from SAP table RMMW1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMMW1 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 RMMW1. 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 RMMW1 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_RMMW1 TYPE STANDARD TABLE OF RMMW1,
      WA_RMMW1 TYPE RMMW1,
      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: <RMMW1> TYPE RMMW1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMMW1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMMW1
  INTO TABLE IT_RMMW1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMMW1
*  INTO TABLE @DATA(IT_RMMW12).
*--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_RMMW1 INDEX 1 INTO DATA(WA_RMMW12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMMW1 ASSIGNING <RMMW1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMMW1>-MATNR = 1.
<RMMW1>-MTART = 1.
<RMMW1>-MATKL = 1.
<RMMW1>-ATTYP = 1.
<RMMW1>-RMATN = 1.

ENDLOOP.

LOOP AT IT_RMMW1 INTO WA_RMMW1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMMW1-VARNR, sy-vline,
  WA_RMMW1-EKORG, sy-vline,
  WA_RMMW1-LIFNR, sy-vline,
  WA_RMMW1-LTSNR, sy-vline,
  WA_RMMW1-EKWRK, sy-vline,
  WA_RMMW1-VKORG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMMW1 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_RMMW1 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_RMMW1 INTO WA_RMMW1.


*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 MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMMW1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMW1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field RMATN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMMW1-RMATN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMW1-RMATN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field VARNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMMW1-VARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMW1-VARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMMW1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMW1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMMW1-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMW1-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMMW1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMW1-KUNNR.
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_RMMW1_STR, 
MATNR TYPE STRING,
MTART TYPE STRING,
MATKL TYPE STRING,
ATTYP TYPE STRING,
RMATN TYPE STRING,
VARNR TYPE STRING,
EKORG TYPE STRING,
LIFNR TYPE STRING,
LTSNR TYPE STRING,
EKWRK TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
BTWRK TYPE STRING,
VRKME TYPE STRING,
FIWRK TYPE STRING,
VZWRK TYPE STRING,
FIVKO TYPE STRING,
FIVTW TYPE STRING,
BGEXT TYPE STRING,
PLTYP TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
VZLGORT TYPE STRING,
FILGORT TYPE STRING,
VZBWTAR TYPE STRING,
FIBWTAR TYPE STRING,
KUNNR TYPE STRING,
VKWRK TYPE STRING,
CONFIG_KLART TYPE STRING,
CONFIG_CLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMMW1_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_RMMW1_STR-MATNR sy-vline 
WA_RMMW1_STR-MTART sy-vline 
WA_RMMW1_STR-MATKL sy-vline 
WA_RMMW1_STR-ATTYP sy-vline 
WA_RMMW1_STR-RMATN sy-vline 
WA_RMMW1_STR-VARNR sy-vline 
WA_RMMW1_STR-EKORG sy-vline 
WA_RMMW1_STR-LIFNR sy-vline 
WA_RMMW1_STR-LTSNR sy-vline 
WA_RMMW1_STR-EKWRK sy-vline 
WA_RMMW1_STR-VKORG sy-vline 
WA_RMMW1_STR-VTWEG sy-vline 
WA_RMMW1_STR-BTWRK sy-vline 
WA_RMMW1_STR-VRKME sy-vline 
WA_RMMW1_STR-FIWRK sy-vline 
WA_RMMW1_STR-VZWRK sy-vline 
WA_RMMW1_STR-FIVKO sy-vline 
WA_RMMW1_STR-FIVTW sy-vline 
WA_RMMW1_STR-BGEXT sy-vline 
WA_RMMW1_STR-PLTYP sy-vline 
WA_RMMW1_STR-LGNUM sy-vline 
WA_RMMW1_STR-LGTYP sy-vline 
WA_RMMW1_STR-VZLGORT sy-vline 
WA_RMMW1_STR-FILGORT sy-vline 
WA_RMMW1_STR-VZBWTAR sy-vline 
WA_RMMW1_STR-FIBWTAR sy-vline 
WA_RMMW1_STR-KUNNR sy-vline 
WA_RMMW1_STR-VKWRK sy-vline 
WA_RMMW1_STR-CONFIG_KLART sy-vline 
WA_RMMW1_STR-CONFIG_CLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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