ABAP Select data from SAP table ISTLHEADERUNIT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISTLHEADERUNIT
*  INTO TABLE @DATA(IT_ISTLHEADERUNIT2).
*--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_ISTLHEADERUNIT INDEX 1 INTO DATA(WA_ISTLHEADERUNIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISTLHEADERUNIT>-MANDT = 1.
<ISTLHEADERUNIT>-SETTLEMENTUNITUUID = 1.
<ISTLHEADERUNIT>-CONTRACTAPPLICATIONUUID = 1.
<ISTLHEADERUNIT>-CONTRACTAPPLICATIONVERSION = 1.
<ISTLHEADERUNIT>-CONTRACTNUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISTLHEADERUNIT-CONTRACTITEM, sy-vline,
  WA_ISTLHEADERUNIT-CONTRACTCOMMODITYITEM, sy-vline,
  WA_ISTLHEADERUNIT-SETTLEMENTCREATEDON, sy-vline,
  WA_ISTLHEADERUNIT-SETTLMTCAT, sy-vline,
  WA_ISTLHEADERUNIT-CONTRACTAPPLICATIONDOCUMENT, sy-vline,
  WA_ISTLHEADERUNIT-APPLICATIONDOCUMENTITEM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISTLHEADERUNIT 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_ISTLHEADERUNIT 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_ISTLHEADERUNIT INTO WA_ISTLHEADERUNIT.


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

*Conversion exit TSTLC, internal->external for field SETTLEMENTCREATEDON
CALL FUNCTION 'CONVERSION_EXIT_TSTLC_OUTPUT'
  EXPORTING
    input =                      WA_ISTLHEADERUNIT-SETTLEMENTCREATEDON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISTLHEADERUNIT-SETTLEMENTCREATEDON.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit GJAHR, internal->external for field SETTLMTDOCYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_ISTLHEADERUNIT-SETTLMTDOCYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISTLHEADERUNIT-SETTLMTDOCYEAR.
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_ISTLHEADERUNIT_STR, 
MANDT TYPE STRING,
SETTLEMENTUNITUUID TYPE STRING,
CONTRACTAPPLICATIONUUID TYPE STRING,
CONTRACTAPPLICATIONVERSION TYPE STRING,
CONTRACTNUM TYPE STRING,
CONTRACTITEM TYPE STRING,
CONTRACTCOMMODITYITEM TYPE STRING,
SETTLEMENTCREATEDON TYPE STRING,
SETTLMTCAT TYPE STRING,
CONTRACTAPPLICATIONDOCUMENT TYPE STRING,
APPLICATIONDOCUMENTITEM TYPE STRING,
SETTLEMENTSTATUSOBJECT TYPE STRING,
CONTRACTQTYCANCELLATIONUUID TYPE STRING,
SETTLEMENTTYPE TYPE STRING,
SETTLMTDOC TYPE STRING,
SETTLMTDOCYEAR TYPE STRING,
STATUSCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISTLHEADERUNIT_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_ISTLHEADERUNIT_STR-MANDT sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLEMENTUNITUUID sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTAPPLICATIONUUID sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTAPPLICATIONVERSION sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTNUM sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTITEM sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTCOMMODITYITEM sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLEMENTCREATEDON sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLMTCAT sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTAPPLICATIONDOCUMENT sy-vline 
WA_ISTLHEADERUNIT_STR-APPLICATIONDOCUMENTITEM sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLEMENTSTATUSOBJECT sy-vline 
WA_ISTLHEADERUNIT_STR-CONTRACTQTYCANCELLATIONUUID sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLEMENTTYPE sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLMTDOC sy-vline 
WA_ISTLHEADERUNIT_STR-SETTLMTDOCYEAR sy-vline 
WA_ISTLHEADERUNIT_STR-STATUSCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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