ABAP Select data from SAP table RMMG2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMMG2 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 RMMG2. 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 RMMG2 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_RMMG2 TYPE STANDARD TABLE OF RMMG2,
      WA_RMMG2 TYPE RMMG2,
      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: <RMMG2> TYPE RMMG2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMMG2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMMG2
  INTO TABLE IT_RMMG2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMMG2
*  INTO TABLE @DATA(IT_RMMG22).
*--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_RMMG2 INDEX 1 INTO DATA(WA_RMMG22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMMG2 ASSIGNING <RMMG2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMMG2>-BESKZ = 1.
<RMMG2>-MAX_PFSTAT = 1.
<RMMG2>-KALK_NEU = 1.
<RMMG2>-VB_TEXT = 1.
<RMMG2>-VB_BESTTXT = 1.

ENDLOOP.

LOOP AT IT_RMMG2 INTO WA_RMMG2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMMG2-VB_PRUETXT, sy-vline,
  WA_RMMG2-VB_VERTTXT, sy-vline,
  WA_RMMG2-VB_GRUNTXT, sy-vline,
  WA_RMMG2-VB_IVERTXT, sy-vline,
  WA_RMMG2-LANGTEXT, sy-vline,
  WA_RMMG2-BEST_PROZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMMG2 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_RMMG2 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_RMMG2 INTO WA_RMMG2.


*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_RMMG2_STR, 
BESKZ TYPE STRING,
MAX_PFSTAT TYPE STRING,
KALK_NEU TYPE STRING,
VB_TEXT TYPE STRING,
VB_BESTTXT TYPE STRING,
VB_PRUETXT TYPE STRING,
VB_VERTTXT TYPE STRING,
VB_GRUNTXT TYPE STRING,
VB_IVERTXT TYPE STRING,
LANGTEXT TYPE STRING,
BEST_PROZ TYPE STRING,
PRUE_PROZ TYPE STRING,
VERT_PROZ TYPE STRING,
GRUN_PROZ TYPE STRING,
IVER_PROZ TYPE STRING,
VPERI_PROZ TYPE STRING,
VJAHR_PROZ TYPE STRING,
VB_KOND TYPE STRING,
VB_KLAS TYPE STRING,
VB_KLAS_SUB TYPE STRING,
VB_QMAT TYPE STRING,
VB_MEAN TYPE STRING,
VB_DOKM TYPE STRING,
VB_REVL TYPE STRING,
VB_KONF TYPE STRING,
NEW_INST TYPE STRING,
VB_KONF_V TYPE STRING,
NEW_INST_V TYPE STRING,
VB_KONF_A TYPE STRING,
NEW_INST_A TYPE STRING,
VB_CSPL TYPE STRING,
VB_PLVB TYPE STRING,
VB_PGDATA TYPE STRING,
VP_EINST TYPE STRING,
VP_SPERR TYPE STRING,
DIREKTSTAT TYPE STRING,
FLGMVER TYPE STRING,
FLGSCHLUES TYPE STRING,
TCODEENDE TYPE STRING,
MEINHVERAR TYPE STRING,
XCHAR_BEW TYPE STRING,
XCHAR_CHPF TYPE STRING,
FLGBWTTY TYPE STRING,
MDIP_MOVE TYPE STRING,
FLG_PROW TYPE STRING,
FLGSTEUER TYPE STRING,
FLGPROGW TYPE STRING,
XCHPF_HART TYPE STRING,
STEUERMUSS TYPE STRING,
LVOR_BWKEY TYPE STRING,
LVOR_LGNUM TYPE STRING,
LVOR_WERKS TYPE STRING,
LVOR_ZENTR TYPE STRING,
DATAB_DISP TYPE STRING,
KALK_LOSGR TYPE STRING,
UPD_NFMAT TYPE STRING,
KZ_XCHPF_A TYPE STRING,
CHARGEBENE TYPE STRING,
KZTLB TYPE STRING,
FLGKTREF TYPE STRING,
UPD_SPDATA TYPE STRING,
MKALVERARB TYPE STRING,
MAEXVERARB TYPE STRING,
FLGMEINREF TYPE STRING,
MEINS_DIML TYPE STRING,
KOKRS TYPE STRING,
KZLTXW TYPE STRING,
KZKFG TYPE STRING,
KONF_INIT TYPE STRING,
CALL_FUNC TYPE STRING,
VB_PRGNMSG TYPE STRING,
VB_PRGNSTA TYPE STRING,
VB_NOTE TYPE STRING,
FLGMAPE TYPE STRING,
FLG_RETAIL TYPE STRING,
MANBR TYPE STRING,
KZMPN TYPE STRING,
CALL_MODE2 TYPE STRING,
FLG_INFLATION TYPE STRING,
VB_DIBER TYPE STRING,
VB_PLPARA TYPE STRING,
FLG_PLM TYPE STRING,
FLG_MDG TYPE STRING,
FLG_ISBATCH TYPE STRING,
VB_VARID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMMG2_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_RMMG2_STR-BESKZ sy-vline 
WA_RMMG2_STR-MAX_PFSTAT sy-vline 
WA_RMMG2_STR-KALK_NEU sy-vline 
WA_RMMG2_STR-VB_TEXT sy-vline 
WA_RMMG2_STR-VB_BESTTXT sy-vline 
WA_RMMG2_STR-VB_PRUETXT sy-vline 
WA_RMMG2_STR-VB_VERTTXT sy-vline 
WA_RMMG2_STR-VB_GRUNTXT sy-vline 
WA_RMMG2_STR-VB_IVERTXT sy-vline 
WA_RMMG2_STR-LANGTEXT sy-vline 
WA_RMMG2_STR-BEST_PROZ sy-vline 
WA_RMMG2_STR-PRUE_PROZ sy-vline 
WA_RMMG2_STR-VERT_PROZ sy-vline 
WA_RMMG2_STR-GRUN_PROZ sy-vline 
WA_RMMG2_STR-IVER_PROZ sy-vline 
WA_RMMG2_STR-VPERI_PROZ sy-vline 
WA_RMMG2_STR-VJAHR_PROZ sy-vline 
WA_RMMG2_STR-VB_KOND sy-vline 
WA_RMMG2_STR-VB_KLAS sy-vline 
WA_RMMG2_STR-VB_KLAS_SUB sy-vline 
WA_RMMG2_STR-VB_QMAT sy-vline 
WA_RMMG2_STR-VB_MEAN sy-vline 
WA_RMMG2_STR-VB_DOKM sy-vline 
WA_RMMG2_STR-VB_REVL sy-vline 
WA_RMMG2_STR-VB_KONF sy-vline 
WA_RMMG2_STR-NEW_INST sy-vline 
WA_RMMG2_STR-VB_KONF_V sy-vline 
WA_RMMG2_STR-NEW_INST_V sy-vline 
WA_RMMG2_STR-VB_KONF_A sy-vline 
WA_RMMG2_STR-NEW_INST_A sy-vline 
WA_RMMG2_STR-VB_CSPL sy-vline 
WA_RMMG2_STR-VB_PLVB sy-vline 
WA_RMMG2_STR-VB_PGDATA sy-vline 
WA_RMMG2_STR-VP_EINST sy-vline 
WA_RMMG2_STR-VP_SPERR sy-vline 
WA_RMMG2_STR-DIREKTSTAT sy-vline 
WA_RMMG2_STR-FLGMVER sy-vline 
WA_RMMG2_STR-FLGSCHLUES sy-vline 
WA_RMMG2_STR-TCODEENDE sy-vline 
WA_RMMG2_STR-MEINHVERAR sy-vline 
WA_RMMG2_STR-XCHAR_BEW sy-vline 
WA_RMMG2_STR-XCHAR_CHPF sy-vline 
WA_RMMG2_STR-FLGBWTTY sy-vline 
WA_RMMG2_STR-MDIP_MOVE sy-vline 
WA_RMMG2_STR-FLG_PROW sy-vline 
WA_RMMG2_STR-FLGSTEUER sy-vline 
WA_RMMG2_STR-FLGPROGW sy-vline 
WA_RMMG2_STR-XCHPF_HART sy-vline 
WA_RMMG2_STR-STEUERMUSS sy-vline 
WA_RMMG2_STR-LVOR_BWKEY sy-vline 
WA_RMMG2_STR-LVOR_LGNUM sy-vline 
WA_RMMG2_STR-LVOR_WERKS sy-vline 
WA_RMMG2_STR-LVOR_ZENTR sy-vline 
WA_RMMG2_STR-DATAB_DISP sy-vline 
WA_RMMG2_STR-KALK_LOSGR sy-vline 
WA_RMMG2_STR-UPD_NFMAT sy-vline 
WA_RMMG2_STR-KZ_XCHPF_A sy-vline 
WA_RMMG2_STR-CHARGEBENE sy-vline 
WA_RMMG2_STR-KZTLB sy-vline 
WA_RMMG2_STR-FLGKTREF sy-vline 
WA_RMMG2_STR-UPD_SPDATA sy-vline 
WA_RMMG2_STR-MKALVERARB sy-vline 
WA_RMMG2_STR-MAEXVERARB sy-vline 
WA_RMMG2_STR-FLGMEINREF sy-vline 
WA_RMMG2_STR-MEINS_DIML sy-vline 
WA_RMMG2_STR-KOKRS sy-vline 
WA_RMMG2_STR-KZLTXW sy-vline 
WA_RMMG2_STR-KZKFG sy-vline 
WA_RMMG2_STR-KONF_INIT sy-vline 
WA_RMMG2_STR-CALL_FUNC sy-vline 
WA_RMMG2_STR-VB_PRGNMSG sy-vline 
WA_RMMG2_STR-VB_PRGNSTA sy-vline 
WA_RMMG2_STR-VB_NOTE sy-vline 
WA_RMMG2_STR-FLGMAPE sy-vline 
WA_RMMG2_STR-FLG_RETAIL sy-vline 
WA_RMMG2_STR-MANBR sy-vline 
WA_RMMG2_STR-KZMPN sy-vline 
WA_RMMG2_STR-CALL_MODE2 sy-vline 
WA_RMMG2_STR-FLG_INFLATION sy-vline 
WA_RMMG2_STR-VB_DIBER sy-vline 
WA_RMMG2_STR-VB_PLPARA sy-vline 
WA_RMMG2_STR-FLG_PLM sy-vline 
WA_RMMG2_STR-FLG_MDG sy-vline 
WA_RMMG2_STR-FLG_ISBATCH sy-vline 
WA_RMMG2_STR-VB_VARID sy-vline      INTO ld_text SEPARATED BY SPACE.

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