ABAP Select data from SAP table MRM_S_EXT_ITEM_PO_REF_FRSEG 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_EXT_ITEM_PO_REF_FRSEG 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_EXT_ITEM_PO_REF_FRSEG. 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_EXT_ITEM_PO_REF_FRSEG 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_EXT_ITEM_PO_REF_FRSEG TYPE STANDARD TABLE OF MRM_S_EXT_ITEM_PO_REF_FRSEG,
      WA_MRM_S_EXT_ITEM_PO_REF_FRSEG TYPE MRM_S_EXT_ITEM_PO_REF_FRSEG,
      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_EXT_ITEM_PO_REF_FRSEG> TYPE MRM_S_EXT_ITEM_PO_REF_FRSEG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRM_S_EXT_ITEM_PO_REF_FRSEG
*  INTO TABLE @DATA(IT_MRM_S_EXT_ITEM_PO_REF_FRSEG2).
*--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_EXT_ITEM_PO_REF_FRSEG INDEX 1 INTO DATA(WA_MRM_S_EXT_ITEM_PO_REF_FRSEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRM_S_EXT_ITEM_PO_REF_FRSEG>-PURCHASEORDER = 1.
<MRM_S_EXT_ITEM_PO_REF_FRSEG>-PURCHASEORDERITEM = 1.
<MRM_S_EXT_ITEM_PO_REF_FRSEG>-REFERENCEDOCUMENT = 1.
<MRM_S_EXT_ITEM_PO_REF_FRSEG>-REFERENCEDOCUMENTFISCALYEAR = 1.
<MRM_S_EXT_ITEM_PO_REF_FRSEG>-REFERENCEDOCUMENTITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-QUANTITYINPURCHASEORDERUNIT, sy-vline,
  WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-TAXCODE, sy-vline,
  WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-SUPPLIERINVOICEITEMTEXT, sy-vline,
  WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-SUPPLIERINVOICEITEMAMOUNT, sy-vline,
  WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-ISNOTCASHDISCOUNTLIABLE, sy-vline,
  WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-PURCHASEORDERQUANTITYUNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRM_S_EXT_ITEM_PO_REF_FRSEG 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_EXT_ITEM_PO_REF_FRSEG 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_EXT_ITEM_PO_REF_FRSEG INTO WA_MRM_S_EXT_ITEM_PO_REF_FRSEG.


*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_EXT_ITEM_PO_REF_FRSEG-PURCHASEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-PURCHASEORDER.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field REFERENCEDOCUMENTFISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-REFERENCEDOCUMENTFISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-REFERENCEDOCUMENTFISCALYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field PURCHASEORDERQUANTITYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-PURCHASEORDERQUANTITYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_S_EXT_ITEM_PO_REF_FRSEG-PURCHASEORDERQUANTITYUNIT.
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_EXT_ITEM_PO_REF_FRSEG_STR, 
PURCHASEORDER TYPE STRING,
PURCHASEORDERITEM TYPE STRING,
REFERENCEDOCUMENT TYPE STRING,
REFERENCEDOCUMENTFISCALYEAR TYPE STRING,
REFERENCEDOCUMENTITEM TYPE STRING,
QUANTITYINPURCHASEORDERUNIT TYPE STRING,
TAXCODE TYPE STRING,
SUPPLIERINVOICEITEMTEXT TYPE STRING,
SUPPLIERINVOICEITEMAMOUNT TYPE STRING,
ISNOTCASHDISCOUNTLIABLE TYPE STRING,
PURCHASEORDERQUANTITYUNIT TYPE STRING,
DUMMY_MMIV_SI_S_ITEM_EEW_PS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_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_EXT_ITEM_PO_REF_FRSEG_STR-PURCHASEORDER sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-PURCHASEORDERITEM sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-REFERENCEDOCUMENT sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-REFERENCEDOCUMENTFISCALYEAR sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-REFERENCEDOCUMENTITEM sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-QUANTITYINPURCHASEORDERUNIT sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-TAXCODE sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-SUPPLIERINVOICEITEMTEXT sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-SUPPLIERINVOICEITEMAMOUNT sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-ISNOTCASHDISCOUNTLIABLE sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-PURCHASEORDERQUANTITYUNIT sy-vline 
WA_MRM_S_EXT_ITEM_PO_REF_FRSEG_STR-DUMMY_MMIV_SI_S_ITEM_EEW_PS sy-vline      INTO ld_text SEPARATED BY SPACE.

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