ABAP Select data from SAP table ISCNTAXINPUTINVOICEITEMTP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISCNTAXINPUTINVOICEITEMTP
*  INTO TABLE @DATA(IT_ISCNTAXINPUTINVOICEITEMTP2).
*--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_ISCNTAXINPUTINVOICEITEMTP INDEX 1 INTO DATA(WA_ISCNTAXINPUTINVOICEITEMTP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISCNTAXINPUTINVOICEITEMTP>-KEY = 1.
<ISCNTAXINPUTINVOICEITEMTP>-PARENT_KEY = 1.
<ISCNTAXINPUTINVOICEITEMTP>-ROOT_KEY = 1.
<ISCNTAXINPUTINVOICEITEMTP>-TAXINVOICEITEMUUID = 1.
<ISCNTAXINPUTINVOICEITEMTP>-CN_TAXINVCUUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISCNTAXINPUTINVOICEITEMTP-CN_TAXINVCCODE, sy-vline,
  WA_ISCNTAXINPUTINVOICEITEMTP-CN_TAXINVCNMBR, sy-vline,
  WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEM, sy-vline,
  WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMGOODSSERVICENAME, sy-vline,
  WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMGOODSNUMBER, sy-vline,
  WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMSPECMODEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISCNTAXINPUTINVOICEITEMTP 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_ISCNTAXINPUTINVOICEITEMTP 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_ISCNTAXINPUTINVOICEITEMTP INTO WA_ISCNTAXINPUTINVOICEITEMTP.


*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 AC172, internal->external for field TAXINVOICEITEMNETAMOUNT
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMNETAMOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMNETAMOUNT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field TAXINVOICEITEMTAXAMOUNT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMTAXAMOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISCNTAXINPUTINVOICEITEMTP-TAXINVOICEITEMTAXAMOUNT.
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_ISCNTAXINPUTINVOICEITEMTP_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
TAXINVOICEITEMUUID TYPE STRING,
CN_TAXINVCUUID TYPE STRING,
CN_TAXINVCCODE TYPE STRING,
CN_TAXINVCNMBR TYPE STRING,
TAXINVOICEITEM TYPE STRING,
TAXINVOICEITEMGOODSSERVICENAME TYPE STRING,
TAXINVOICEITEMGOODSNUMBER TYPE STRING,
TAXINVOICEITEMSPECMODEL TYPE STRING,
TAXINVOICEITEMUNITDESCRIPTION TYPE STRING,
TAXINVOICEITEMQUANTITY TYPE STRING,
CN_TAXINVCCRCY TYPE STRING,
TAXINVOICEITEMNETUNITPRICE TYPE STRING,
TAXINVOICEITEMNETAMOUNT TYPE STRING,
TAXINVOICEITEMTAXRATE TYPE STRING,
TAXINVOICEITEMTAXAMOUNT TYPE STRING,
TAXINVOICEITEMTOLLCARLICPLATE TYPE STRING,
TAXINVOICEITEMTOLLCARCATEGORY TYPE STRING,
TAXINVOICEITEMTOLLSTRTDATETIME TYPE STRING,
TAXINVOICEITEMTOLLENDDATETIME TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYCONSISTENCYSTATUS TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,
DUMMY_FICNTXI_ITM_INCL_EEW_PS TYPE STRING,
ISACTIVEENTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISCNTAXINPUTINVOICEITEMTP_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_ISCNTAXINPUTINVOICEITEMTP_STR-KEY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-PARENT_KEY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-ROOT_KEY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMUUID sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-CN_TAXINVCUUID sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-CN_TAXINVCCODE sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-CN_TAXINVCNMBR sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEM sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMGOODSSERVICENAME sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMGOODSNUMBER sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMSPECMODEL sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMUNITDESCRIPTION sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMQUANTITY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-CN_TAXINVCCRCY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMNETUNITPRICE sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMNETAMOUNT sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMTAXRATE sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMTAXAMOUNT sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMTOLLCARLICPLATE sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMTOLLCARCATEGORY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMTOLLSTRTDATETIME sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-TAXINVOICEITEMTOLLENDDATETIME sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-HASACTIVEENTITY sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-DRAFTENTITYCONSISTENCYSTATUS sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-DRAFTENTITYOPERATIONCODE sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-DUMMY_FICNTXI_ITM_INCL_EEW_PS sy-vline 
WA_ISCNTAXINPUTINVOICEITEMTP_STR-ISACTIVEENTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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