ABAP Select data from SAP table MRM_S_EXT_INVOICE_HEADER 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_INVOICE_HEADER 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_INVOICE_HEADER. 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_INVOICE_HEADER 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_INVOICE_HEADER TYPE STANDARD TABLE OF MRM_S_EXT_INVOICE_HEADER,
      WA_MRM_S_EXT_INVOICE_HEADER TYPE MRM_S_EXT_INVOICE_HEADER,
      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_INVOICE_HEADER> TYPE MRM_S_EXT_INVOICE_HEADER.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRM_S_EXT_INVOICE_HEADER
*  INTO TABLE @DATA(IT_MRM_S_EXT_INVOICE_HEADER2).
*--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_INVOICE_HEADER INDEX 1 INTO DATA(WA_MRM_S_EXT_INVOICE_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRM_S_EXT_INVOICE_HEADER>-ISINVOICE = 1.
<MRM_S_EXT_INVOICE_HEADER>-COMPANYCODE = 1.
<MRM_S_EXT_INVOICE_HEADER>-DOCUMENTDATE = 1.
<MRM_S_EXT_INVOICE_HEADER>-POSTINGDATE = 1.
<MRM_S_EXT_INVOICE_HEADER>-SUPPLIERINVOICEIDBYINVCGPARTY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRM_S_EXT_INVOICE_HEADER-INVOICINGPARTY, sy-vline,
  WA_MRM_S_EXT_INVOICE_HEADER-INVOICEGROSSAMOUNT, sy-vline,
  WA_MRM_S_EXT_INVOICE_HEADER-DOCUMENTCURRENCY, sy-vline,
  WA_MRM_S_EXT_INVOICE_HEADER-PAYMENTBLOCKINGREASON, sy-vline,
  WA_MRM_S_EXT_INVOICE_HEADER-DUECALCULATIONBASEDATE, sy-vline,
  WA_MRM_S_EXT_INVOICE_HEADER-MANUALCASHDISCOUNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRM_S_EXT_INVOICE_HEADER 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_INVOICE_HEADER 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_INVOICE_HEADER INTO WA_MRM_S_EXT_INVOICE_HEADER.


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

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

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

*Conversion exit ALPHA, internal->external for field PAYTSLIPWTHREFREFERENCE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRM_S_EXT_INVOICE_HEADER-PAYTSLIPWTHREFREFERENCE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_S_EXT_INVOICE_HEADER-PAYTSLIPWTHREFREFERENCE.
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_INVOICE_HEADER_STR, 
ISINVOICE TYPE STRING,
COMPANYCODE TYPE STRING,
DOCUMENTDATE TYPE STRING,
POSTINGDATE TYPE STRING,
SUPPLIERINVOICEIDBYINVCGPARTY TYPE STRING,
INVOICINGPARTY TYPE STRING,
INVOICEGROSSAMOUNT TYPE STRING,
DOCUMENTCURRENCY TYPE STRING,
PAYMENTBLOCKINGREASON TYPE STRING,
DUECALCULATIONBASEDATE TYPE STRING,
MANUALCASHDISCOUNT TYPE STRING,
PAYMENTMETHOD TYPE STRING,
PAYMENTMETHODSUPPLEMENT TYPE STRING,
PAYMENTREFERENCE TYPE STRING,
INVOICEREFERENCE TYPE STRING,
INVOICEREFERENCEFISCALYEAR TYPE STRING,
PAYMENTTERMS TYPE STRING,
CASHDISCOUNT1DAYS TYPE STRING,
CASHDISCOUNT1PERCENT TYPE STRING,
CASHDISCOUNT2DAYS TYPE STRING,
CASHDISCOUNT2PERCENT TYPE STRING,
NETPAYMENTDAYS TYPE STRING,
FIXEDCASHDISCOUNT TYPE STRING,
UNPLANNEDDELIVERYCOST TYPE STRING,
UNPLANNEDDELIVERYCOSTTAXCODE TYPE STRING,
ACCOUNTINGDOCUMENTTYPE TYPE STRING,
ASSIGNMENTREFERENCE TYPE STRING,
SUPPLIERPOSTINGLINEITEMTEXT TYPE STRING,
ACCOUNTINGDOCUMENTHEADERTEXT TYPE STRING,
BUSINESSPLACE TYPE STRING,
BUSINESSSECTIONCODE TYPE STRING,
PAYTSLIPWTHREFSUBSCRIBER TYPE STRING,
PAYTSLIPWTHREFCHECKDIGIT TYPE STRING,
PAYTSLIPWTHREFREFERENCE TYPE STRING,
BUSINESSAREA TYPE STRING,
INVOICERECEIPTDATE TYPE STRING,
ISEUTRIANGULARDEAL TYPE STRING,
DUMMY_MMIV_SI_S_HEADER_EEW_PS TYPE STRING,
SUPPLIERVATREGISTRATION TYPE STRING,
DELIVERYOFGOODSREPORTINGCNTRY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRM_S_EXT_INVOICE_HEADER_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_INVOICE_HEADER_STR-ISINVOICE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-COMPANYCODE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-DOCUMENTDATE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-POSTINGDATE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-SUPPLIERINVOICEIDBYINVCGPARTY sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-INVOICINGPARTY sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-INVOICEGROSSAMOUNT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-DOCUMENTCURRENCY sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYMENTBLOCKINGREASON sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-DUECALCULATIONBASEDATE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-MANUALCASHDISCOUNT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYMENTMETHOD sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYMENTMETHODSUPPLEMENT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYMENTREFERENCE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-INVOICEREFERENCE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-INVOICEREFERENCEFISCALYEAR sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYMENTTERMS sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-CASHDISCOUNT1DAYS sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-CASHDISCOUNT1PERCENT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-CASHDISCOUNT2DAYS sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-CASHDISCOUNT2PERCENT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-NETPAYMENTDAYS sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-FIXEDCASHDISCOUNT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-UNPLANNEDDELIVERYCOST sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-UNPLANNEDDELIVERYCOSTTAXCODE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-ACCOUNTINGDOCUMENTTYPE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-ASSIGNMENTREFERENCE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-SUPPLIERPOSTINGLINEITEMTEXT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-ACCOUNTINGDOCUMENTHEADERTEXT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-BUSINESSPLACE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-BUSINESSSECTIONCODE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYTSLIPWTHREFSUBSCRIBER sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYTSLIPWTHREFCHECKDIGIT sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-PAYTSLIPWTHREFREFERENCE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-BUSINESSAREA sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-INVOICERECEIPTDATE sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-ISEUTRIANGULARDEAL sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-DUMMY_MMIV_SI_S_HEADER_EEW_PS sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-SUPPLIERVATREGISTRATION sy-vline 
WA_MRM_S_EXT_INVOICE_HEADER_STR-DELIVERYOFGOODSREPORTINGCNTRY sy-vline      INTO ld_text SEPARATED BY SPACE.

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