ABAP Select data from SAP table CRMT_ISX_INV_HEADER_IL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRMT_ISX_INV_HEADER_IL
*  INTO TABLE @DATA(IT_CRMT_ISX_INV_HEADER_IL2).
*--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_CRMT_ISX_INV_HEADER_IL INDEX 1 INTO DATA(WA_CRMT_ISX_INV_HEADER_IL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CRMT_ISX_INV_HEADER_IL>-OBJKEY = 1.
<CRMT_ISX_INV_HEADER_IL>-OBJTYPE = 1.
<CRMT_ISX_INV_HEADER_IL>-LOGSYS = 1.
<CRMT_ISX_INV_HEADER_IL>-INVDOCNO = 1.
<CRMT_ISX_INV_HEADER_IL>-ACCOUNT_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRMT_ISX_INV_HEADER_IL-ACCOUNT_DESCR, sy-vline,
  WA_CRMT_ISX_INV_HEADER_IL-BUAG_ID, sy-vline,
  WA_CRMT_ISX_INV_HEADER_IL-BUAG_DESCR, sy-vline,
  WA_CRMT_ISX_INV_HEADER_IL-INV_DOC_TITLE, sy-vline,
  WA_CRMT_ISX_INV_HEADER_IL-BUDAT, sy-vline,
  WA_CRMT_ISX_INV_HEADER_IL-BLDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRMT_ISX_INV_HEADER_IL 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_CRMT_ISX_INV_HEADER_IL 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_CRMT_ISX_INV_HEADER_IL INTO WA_CRMT_ISX_INV_HEADER_IL.


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

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

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

*Conversion exit ALPHA, internal->external for field BUAG_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CRMT_ISX_INV_HEADER_IL-BUAG_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CRMT_ISX_INV_HEADER_IL-BUAG_ID.
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_CRMT_ISX_INV_HEADER_IL_STR, 
OBJKEY TYPE STRING,
OBJTYPE TYPE STRING,
LOGSYS TYPE STRING,
INVDOCNO TYPE STRING,
ACCOUNT_ID TYPE STRING,
ACCOUNT_DESCR TYPE STRING,
BUAG_ID TYPE STRING,
BUAG_DESCR TYPE STRING,
INV_DOC_TITLE TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
FAEDN TYPE STRING,
FAEDS TYPE STRING,
TOTAL_AMT TYPE STRING,
WAERS_TOTAL TYPE STRING,
WAERS TYPE STRING,
GROSS_AMOUNT TYPE STRING,
NET_AMOUNT TYPE STRING,
WAERS_NET TYPE STRING,
TAX_AMOUNT TYPE STRING,
WAERS_TAX TYPE STRING,
REVREASON_DESC TYPE STRING,
PRINTDATE TYPE STRING,
PYMET_DESC TYPE STRING,
STATUS TYPE STRING,
STATUS_DESC TYPE STRING,
TOTAL_AMT_UI TYPE STRING,
ISX_INV_HEADER_DUMMY TYPE STRING,
GROSS_AMT_UI TYPE STRING,
TAX_AMT_UI TYPE STRING,
NET_AMT_UI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRMT_ISX_INV_HEADER_IL_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_CRMT_ISX_INV_HEADER_IL_STR-OBJKEY sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-OBJTYPE sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-LOGSYS sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-INVDOCNO sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-ACCOUNT_ID sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-ACCOUNT_DESCR sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-BUAG_ID sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-BUAG_DESCR sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-INV_DOC_TITLE sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-BUDAT sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-BLDAT sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-FAEDN sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-FAEDS sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-TOTAL_AMT sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-WAERS_TOTAL sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-WAERS sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-GROSS_AMOUNT sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-NET_AMOUNT sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-WAERS_NET sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-TAX_AMOUNT sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-WAERS_TAX sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-REVREASON_DESC sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-PRINTDATE sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-PYMET_DESC sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-STATUS sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-STATUS_DESC sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-TOTAL_AMT_UI sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-ISX_INV_HEADER_DUMMY sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-GROSS_AMT_UI sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-TAX_AMT_UI sy-vline 
WA_CRMT_ISX_INV_HEADER_IL_STR-NET_AMT_UI sy-vline      INTO ld_text SEPARATED BY SPACE.

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