ABAP Select data from SAP table RCEVM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCEVM
*  INTO TABLE @DATA(IT_RCEVM2).
*--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_RCEVM INDEX 1 INTO DATA(WA_RCEVM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCEVM>-MANDT = 1.
<RCEVM>-METNR = 1.
<RCEVM>-LTXKZ = 1.
<RCEVM>-BLUB1 = 1.
<RCEVM>-BLUB2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCEVM-BLUB3, sy-vline,
  WA_RCEVM-BLUB4, sy-vline,
  WA_RCEVM-BLUB5, sy-vline,
  WA_RCEVM-BLUB6, sy-vline,
  WA_RCEVM-FOMNR, sy-vline,
  WA_RCEVM-MTHRK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCEVM 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_RCEVM 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_RCEVM INTO WA_RCEVM.


*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 CUNIT, internal->external for field MSEHI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RCEVM-MSEHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCEVM-MSEHI.
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_RCEVM_STR, 
MANDT TYPE STRING,
METNR TYPE STRING,
LTXKZ TYPE STRING,
BLUB1 TYPE STRING,
BLUB2 TYPE STRING,
BLUB3 TYPE STRING,
BLUB4 TYPE STRING,
BLUB5 TYPE STRING,
BLUB6 TYPE STRING,
FOMNR TYPE STRING,
MTHRK TYPE STRING,
MSTUF TYPE STRING,
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
ATFOR TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
ATWRT TYPE STRING,
PAHER TYPE STRING,
PAHE2 TYPE STRING,
PAHNR TYPE STRING,
PAHSC TYPE STRING,
MSEHI TYPE STRING,
VORKZ TYPE STRING,
PAWRT TYPE STRING,
STUMP TYPE STRING,
ENTRY_ACT TYPE STRING,
ENTRIES TYPE STRING,
GROUPI_ID TYPE STRING,
RICHTUNG2 TYPE STRING,
RICHTUNG TYPE STRING,
PRUEFUNG2 TYPE STRING,
PRUEFUNG TYPE STRING,
SUCHEN TYPE STRING,
PRUEFEN TYPE STRING,
KONVERT TYPE STRING,
MENU_VORS TYPE STRING,
DATENBANK TYPE STRING,
ERZEUGNIS TYPE STRING,
TEIL TYPE STRING,
TAB_TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCEVM_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_RCEVM_STR-MANDT sy-vline 
WA_RCEVM_STR-METNR sy-vline 
WA_RCEVM_STR-LTXKZ sy-vline 
WA_RCEVM_STR-BLUB1 sy-vline 
WA_RCEVM_STR-BLUB2 sy-vline 
WA_RCEVM_STR-BLUB3 sy-vline 
WA_RCEVM_STR-BLUB4 sy-vline 
WA_RCEVM_STR-BLUB5 sy-vline 
WA_RCEVM_STR-BLUB6 sy-vline 
WA_RCEVM_STR-FOMNR sy-vline 
WA_RCEVM_STR-MTHRK sy-vline 
WA_RCEVM_STR-MSTUF sy-vline 
WA_RCEVM_STR-ATNAM sy-vline 
WA_RCEVM_STR-ATBEZ sy-vline 
WA_RCEVM_STR-ATFOR sy-vline 
WA_RCEVM_STR-ANZST sy-vline 
WA_RCEVM_STR-ANZDZ sy-vline 
WA_RCEVM_STR-ATWRT sy-vline 
WA_RCEVM_STR-PAHER sy-vline 
WA_RCEVM_STR-PAHE2 sy-vline 
WA_RCEVM_STR-PAHNR sy-vline 
WA_RCEVM_STR-PAHSC sy-vline 
WA_RCEVM_STR-MSEHI sy-vline 
WA_RCEVM_STR-VORKZ sy-vline 
WA_RCEVM_STR-PAWRT sy-vline 
WA_RCEVM_STR-STUMP sy-vline 
WA_RCEVM_STR-ENTRY_ACT sy-vline 
WA_RCEVM_STR-ENTRIES sy-vline 
WA_RCEVM_STR-GROUPI_ID sy-vline 
WA_RCEVM_STR-RICHTUNG2 sy-vline 
WA_RCEVM_STR-RICHTUNG sy-vline 
WA_RCEVM_STR-PRUEFUNG2 sy-vline 
WA_RCEVM_STR-PRUEFUNG sy-vline 
WA_RCEVM_STR-SUCHEN sy-vline 
WA_RCEVM_STR-PRUEFEN sy-vline 
WA_RCEVM_STR-KONVERT sy-vline 
WA_RCEVM_STR-MENU_VORS sy-vline 
WA_RCEVM_STR-DATENBANK sy-vline 
WA_RCEVM_STR-ERZEUGNIS sy-vline 
WA_RCEVM_STR-TEIL sy-vline 
WA_RCEVM_STR-TAB_TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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