ABAP Select data from SAP table RMMG1 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 RMMG1 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 RMMG1. 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 RMMG1 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_RMMG1 TYPE STANDARD TABLE OF RMMG1,
      WA_RMMG1 TYPE RMMG1,
      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: <RMMG1> TYPE RMMG1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMMG1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMMG1
  INTO TABLE IT_RMMG1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMMG1
*  INTO TABLE @DATA(IT_RMMG12).
*--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_RMMG1 INDEX 1 INTO DATA(WA_RMMG12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMMG1 ASSIGNING <RMMG1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMMG1>-MATNR = 1.
<RMMG1>-WERKS = 1.
<RMMG1>-LGORT = 1.
<RMMG1>-BUKRS = 1.
<RMMG1>-BWKEY = 1.

ENDLOOP.

LOOP AT IT_RMMG1 INTO WA_RMMG1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMMG1-BWTAR, sy-vline,
  WA_RMMG1-VKORG, sy-vline,
  WA_RMMG1-VTWEG, sy-vline,
  WA_RMMG1-LGNUM, sy-vline,
  WA_RMMG1-LGTYP, sy-vline,
  WA_RMMG1-MYKEY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMMG1 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_RMMG1 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_RMMG1 INTO WA_RMMG1.


*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_RMMG1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMG1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RMMG1-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMG1-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMMG1-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMG1-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CHANGENR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMMG1-CHANGENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMG1-CHANGENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMMG1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMG1-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MSBOOKPARTNO
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMMG1-MSBOOKPARTNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMMG1-MSBOOKPARTNO.
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_RMMG1_STR, 
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
BUKRS TYPE STRING,
BWKEY TYPE STRING,
BWTAR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
MYKEY TYPE STRING,
SPRAS TYPE STRING,
BUKRS_VKO TYPE STRING,
MBRSH TYPE STRING,
MTART TYPE STRING,
DISPR TYPE STRING,
PROPR TYPE STRING,
KZEXI TYPE STRING,
AENNR TYPE STRING,
AEDAT TYPE STRING,
CHANGENR TYPE STRING,
DLINE TYPE STRING,
BERID TYPE STRING,
BERTY TYPE STRING,
KUNNR TYPE STRING,
EMNFR TYPE STRING,
MFRPN TYPE STRING,
MSBOOKPARTNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMMG1_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_RMMG1_STR-MATNR sy-vline 
WA_RMMG1_STR-WERKS sy-vline 
WA_RMMG1_STR-LGORT sy-vline 
WA_RMMG1_STR-BUKRS sy-vline 
WA_RMMG1_STR-BWKEY sy-vline 
WA_RMMG1_STR-BWTAR sy-vline 
WA_RMMG1_STR-VKORG sy-vline 
WA_RMMG1_STR-VTWEG sy-vline 
WA_RMMG1_STR-LGNUM sy-vline 
WA_RMMG1_STR-LGTYP sy-vline 
WA_RMMG1_STR-MYKEY sy-vline 
WA_RMMG1_STR-SPRAS sy-vline 
WA_RMMG1_STR-BUKRS_VKO sy-vline 
WA_RMMG1_STR-MBRSH sy-vline 
WA_RMMG1_STR-MTART sy-vline 
WA_RMMG1_STR-DISPR sy-vline 
WA_RMMG1_STR-PROPR sy-vline 
WA_RMMG1_STR-KZEXI sy-vline 
WA_RMMG1_STR-AENNR sy-vline 
WA_RMMG1_STR-AEDAT sy-vline 
WA_RMMG1_STR-CHANGENR sy-vline 
WA_RMMG1_STR-DLINE sy-vline 
WA_RMMG1_STR-BERID sy-vline 
WA_RMMG1_STR-BERTY sy-vline 
WA_RMMG1_STR-KUNNR sy-vline 
WA_RMMG1_STR-EMNFR sy-vline 
WA_RMMG1_STR-MFRPN sy-vline 
WA_RMMG1_STR-MSBOOKPARTNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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