ABAP Select data from SAP table MXML_INCINV_DETAIL_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MXML_INCINV_DETAIL_ITEM
*  INTO TABLE @DATA(IT_MXML_INCINV_DETAIL_ITEM2).
*--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_MXML_INCINV_DETAIL_ITEM INDEX 1 INTO DATA(WA_MXML_INCINV_DETAIL_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MXML_INCINV_DETAIL_ITEM>-INVOICE_DOC_ITEM = 1.
<MXML_INCINV_DETAIL_ITEM>-PO_NUMBER = 1.
<MXML_INCINV_DETAIL_ITEM>-PO_ITEM = 1.
<MXML_INCINV_DETAIL_ITEM>-SERIAL_NO = 1.
<MXML_INCINV_DETAIL_ITEM>-REF_DOC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MXML_INCINV_DETAIL_ITEM-REF_DOC_YEAR, sy-vline,
  WA_MXML_INCINV_DETAIL_ITEM-REF_DOC_IT, sy-vline,
  WA_MXML_INCINV_DETAIL_ITEM-DE_CRE_IND, sy-vline,
  WA_MXML_INCINV_DETAIL_ITEM-TAX_CODE, sy-vline,
  WA_MXML_INCINV_DETAIL_ITEM-TAXJURCODE, sy-vline,
  WA_MXML_INCINV_DETAIL_ITEM-ITEM_AMOUNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MXML_INCINV_DETAIL_ITEM 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_MXML_INCINV_DETAIL_ITEM 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_MXML_INCINV_DETAIL_ITEM INTO WA_MXML_INCINV_DETAIL_ITEM.


*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 PO_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MXML_INCINV_DETAIL_ITEM-PO_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MXML_INCINV_DETAIL_ITEM-PO_NUMBER.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit CUNIT, internal->external for field PO_PR_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MXML_INCINV_DETAIL_ITEM-PO_PR_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MXML_INCINV_DETAIL_ITEM-PO_PR_UOM.
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_MXML_INCINV_DETAIL_ITEM_STR, 
INVOICE_DOC_ITEM TYPE STRING,
PO_NUMBER TYPE STRING,
PO_ITEM TYPE STRING,
SERIAL_NO TYPE STRING,
REF_DOC TYPE STRING,
REF_DOC_YEAR TYPE STRING,
REF_DOC_IT TYPE STRING,
DE_CRE_IND TYPE STRING,
TAX_CODE TYPE STRING,
TAXJURCODE TYPE STRING,
ITEM_AMOUNT TYPE STRING,
QUANTITY TYPE STRING,
PO_UNIT TYPE STRING,
PO_UNIT_ISO TYPE STRING,
PO_PR_QNT TYPE STRING,
PO_PR_UOM TYPE STRING,
PO_PR_UOM_ISO TYPE STRING,
COND_TYPE TYPE STRING,
COND_ST_NO TYPE STRING,
COND_COUNT TYPE STRING,
REF_DOC_NO TYPE STRING,
QTY_INVCD TYPE STRING,
INVQTYPOU TYPE STRING,
INV_AMNTFC TYPE STRING,
ITEM_TEXT TYPE STRING,
FINAL_INV TYPE STRING,
REF_DOC_NO_LONG TYPE STRING,
GRIR_CLEAR_SRV TYPE STRING,
TAX_RATE TYPE STRING,
SHORT_TEXT TYPE STRING,
COND_COUNT_LONG TYPE STRING,
TAX_COUNTRY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MXML_INCINV_DETAIL_ITEM_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_MXML_INCINV_DETAIL_ITEM_STR-INVOICE_DOC_ITEM sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_NUMBER sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_ITEM sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-SERIAL_NO sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-REF_DOC sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-REF_DOC_YEAR sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-REF_DOC_IT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-DE_CRE_IND sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-TAX_CODE sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-TAXJURCODE sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-ITEM_AMOUNT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-QUANTITY sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_UNIT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_UNIT_ISO sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_PR_QNT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_PR_UOM sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-PO_PR_UOM_ISO sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-COND_TYPE sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-COND_ST_NO sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-COND_COUNT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-REF_DOC_NO sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-QTY_INVCD sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-INVQTYPOU sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-INV_AMNTFC sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-ITEM_TEXT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-FINAL_INV sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-REF_DOC_NO_LONG sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-GRIR_CLEAR_SRV sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-TAX_RATE sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-SHORT_TEXT sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-COND_COUNT_LONG sy-vline 
WA_MXML_INCINV_DETAIL_ITEM_STR-TAX_COUNTRY sy-vline      INTO ld_text SEPARATED BY SPACE.

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