ABAP Select data from SAP table MRM_S_REVAL_HEADER_ITEM_INFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRM_S_REVAL_HEADER_ITEM_INFO
*  INTO TABLE @DATA(IT_MRM_S_REVAL_HEADER_ITEM_INFO2).
*--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_MRM_S_REVAL_HEADER_ITEM_INFO INDEX 1 INTO DATA(WA_MRM_S_REVAL_HEADER_ITEM_INFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRM_S_REVAL_HEADER_ITEM_INFO>-PURCHASEORDER = 1.
<MRM_S_REVAL_HEADER_ITEM_INFO>-PURCHASEORDERITEM = 1.
<MRM_S_REVAL_HEADER_ITEM_INFO>-PLANT = 1.
<MRM_S_REVAL_HEADER_ITEM_INFO>-INBOUNDDELIVERYNOTE = 1.
<MRM_S_REVAL_HEADER_ITEM_INFO>-MATERIALNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRM_S_REVAL_HEADER_ITEM_INFO-INTERNATIONALARTICLENUMBER, sy-vline,
  WA_MRM_S_REVAL_HEADER_ITEM_INFO-SUPPLIERMATERIALNUMBER, sy-vline,
  WA_MRM_S_REVAL_HEADER_ITEM_INFO-INVOICENETAMOUNT, sy-vline,
  WA_MRM_S_REVAL_HEADER_ITEM_INFO-TOTALQUANTITY, sy-vline,
  WA_MRM_S_REVAL_HEADER_ITEM_INFO-PURGDOCORDERQUANTITYUNIT, sy-vline,
  WA_MRM_S_REVAL_HEADER_ITEM_INFO-PURGDOCORDERQUANTITYUNITTECHNA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRM_S_REVAL_HEADER_ITEM_INFO 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_MRM_S_REVAL_HEADER_ITEM_INFO 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_MRM_S_REVAL_HEADER_ITEM_INFO INTO WA_MRM_S_REVAL_HEADER_ITEM_INFO.


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

*Conversion exit EAN11, internal->external for field INTERNATIONALARTICLENUMBER
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_MRM_S_REVAL_HEADER_ITEM_INFO-INTERNATIONALARTICLENUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_S_REVAL_HEADER_ITEM_INFO-INTERNATIONALARTICLENUMBER.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MRM_S_REVAL_HEADER_ITEM_INFO-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_S_REVAL_HEADER_ITEM_INFO-MATERIAL.
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_MRM_S_REVAL_HEADER_ITEM_INFO_STR, 
PURCHASEORDER TYPE STRING,
PURCHASEORDERITEM TYPE STRING,
PLANT TYPE STRING,
INBOUNDDELIVERYNOTE TYPE STRING,
MATERIALNAME TYPE STRING,
INTERNATIONALARTICLENUMBER TYPE STRING,
SUPPLIERMATERIALNUMBER TYPE STRING,
INVOICENETAMOUNT TYPE STRING,
TOTALQUANTITY TYPE STRING,
PURGDOCORDERQUANTITYUNIT TYPE STRING,
PURGDOCORDERQUANTITYUNITTECHNA TYPE STRING,
PRINTQUANTITY TYPE STRING,
MATERIAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRM_S_REVAL_HEADER_ITEM_INFO_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_MRM_S_REVAL_HEADER_ITEM_INFO_STR-PURCHASEORDER sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-PURCHASEORDERITEM sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-PLANT sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-INBOUNDDELIVERYNOTE sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-MATERIALNAME sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-INTERNATIONALARTICLENUMBER sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-SUPPLIERMATERIALNUMBER sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-INVOICENETAMOUNT sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-TOTALQUANTITY sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-PURGDOCORDERQUANTITYUNIT sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-PURGDOCORDERQUANTITYUNITTECHNA sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-PRINTQUANTITY sy-vline 
WA_MRM_S_REVAL_HEADER_ITEM_INFO_STR-MATERIAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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