ABAP Select data from SAP table /CEECV/BTFI_INV_REG_ITEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /CEECV/BTFI_INV_REG_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 /CEECV/BTFI_INV_REG_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 /CEECV/BTFI_INV_REG_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_/CEECV/BTFI_INV_REG_ITEM TYPE STANDARD TABLE OF /CEECV/BTFI_INV_REG_ITEM,
      WA_/CEECV/BTFI_INV_REG_ITEM TYPE /CEECV/BTFI_INV_REG_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: </CEECV/BTFI_INV_REG_ITEM> TYPE /CEECV/BTFI_INV_REG_ITEM.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /CEECV/BTFI_INV_REG_ITEM
  INTO TABLE IT_/CEECV/BTFI_INV_REG_ITEM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CEECV/BTFI_INV_REG_ITEM
*  INTO TABLE @DATA(IT_/CEECV/BTFI_INV_REG_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_/CEECV/BTFI_INV_REG_ITEM INDEX 1 INTO DATA(WA_/CEECV/BTFI_INV_REG_ITEM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/CEECV/BTFI_INV_REG_ITEM ASSIGNING </CEECV/BTFI_INV_REG_ITEM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CEECV/BTFI_INV_REG_ITEM>-COMP_CODE = 1.
</CEECV/BTFI_INV_REG_ITEM>-LINE_NUMBER = 1.
</CEECV/BTFI_INV_REG_ITEM>-INVOICE_DATE = 1.
</CEECV/BTFI_INV_REG_ITEM>-INVOICE_NUMBER = 1.
</CEECV/BTFI_INV_REG_ITEM>-INVOICE_AMOUNT = 1.

ENDLOOP.

LOOP AT IT_/CEECV/BTFI_INV_REG_ITEM INTO WA_/CEECV/BTFI_INV_REG_ITEM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CEECV/BTFI_INV_REG_ITEM-INVOICE_VAT, sy-vline,
  WA_/CEECV/BTFI_INV_REG_ITEM-SBASH_INT, sy-vline,
  WA_/CEECV/BTFI_INV_REG_ITEM-SBETH_INT, sy-vline,
  WA_/CEECV/BTFI_INV_REG_ITEM-VAT_REG_NUMBER, sy-vline,
  WA_/CEECV/BTFI_INV_REG_ITEM-NAME, sy-vline,
  WA_/CEECV/BTFI_INV_REG_ITEM-CURRENCY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CEECV/BTFI_INV_REG_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_/CEECV/BTFI_INV_REG_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_/CEECV/BTFI_INV_REG_ITEM INTO WA_/CEECV/BTFI_INV_REG_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 AC152, internal->external for field INVOICE_AMOUNT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_/CEECV/BTFI_INV_REG_ITEM-INVOICE_AMOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CEECV/BTFI_INV_REG_ITEM-INVOICE_AMOUNT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field INVOICE_VAT
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_/CEECV/BTFI_INV_REG_ITEM-INVOICE_VAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CEECV/BTFI_INV_REG_ITEM-INVOICE_VAT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit AU132, internal->external for field HWNAF
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_/CEECV/BTFI_INV_REG_ITEM-HWNAF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CEECV/BTFI_INV_REG_ITEM-HWNAF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field HWSTEAA
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_/CEECV/BTFI_INV_REG_ITEM-HWSTEAA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CEECV/BTFI_INV_REG_ITEM-HWSTEAA.
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_/CEECV/BTFI_INV_REG_ITEM_STR, 
COMP_CODE TYPE STRING,
LINE_NUMBER TYPE STRING,
INVOICE_DATE TYPE STRING,
INVOICE_NUMBER TYPE STRING,
INVOICE_AMOUNT TYPE STRING,
INVOICE_VAT TYPE STRING,
SBASH_INT TYPE STRING,
SBETH_INT TYPE STRING,
VAT_REG_NUMBER TYPE STRING,
NAME TYPE STRING,
CURRENCY TYPE STRING,
GJAHR TYPE STRING,
BELNR TYPE STRING,
KTOSL TYPE STRING,
BLDAT TYPE STRING,
HWNAF TYPE STRING,
HWSTEAA TYPE STRING,
BUDAT TYPE STRING,
VATDATE TYPE STRING,
BLART TYPE STRING,
PARTNER_LAND TYPE STRING,
PARTNER_CORP_GROUP TYPE STRING,
SHKZG TYPE STRING,
MWSKZ TYPE STRING,
LAND1 TYPE STRING,
MWART TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CEECV/BTFI_INV_REG_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_/CEECV/BTFI_INV_REG_ITEM_STR-COMP_CODE sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-LINE_NUMBER sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-INVOICE_DATE sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-INVOICE_NUMBER sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-INVOICE_AMOUNT sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-INVOICE_VAT sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-SBASH_INT sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-SBETH_INT sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-VAT_REG_NUMBER sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-NAME sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-CURRENCY sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-GJAHR sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-BELNR sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-KTOSL sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-BLDAT sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-HWNAF sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-HWSTEAA sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-BUDAT sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-VATDATE sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-BLART sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-PARTNER_LAND sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-PARTNER_CORP_GROUP sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-SHKZG sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-MWSKZ sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-LAND1 sy-vline 
WA_/CEECV/BTFI_INV_REG_ITEM_STR-MWART sy-vline      INTO ld_text SEPARATED BY SPACE.

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