ABAP Select data from SAP table ICAINSTLTRHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICAINSTLTRHEADER
*  INTO TABLE @DATA(IT_ICAINSTLTRHEADER2).
*--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_ICAINSTLTRHEADER INDEX 1 INTO DATA(WA_ICAINSTLTRHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICAINSTLTRHEADER>-MANDT = 1.
<ICAINSTLTRHEADER>-CAINSTALLMENTPLAN = 1.
<ICAINSTLTRHEADER>-BUSINESSPARTNER = 1.
<ICAINSTLTRHEADER>-CACORRESPONDENCE = 1.
<ICAINSTLTRHEADER>-CACORRESPONDENCETYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICAINSTLTRHEADER-CAINSTALLMENTPLANSTARTDATE, sy-vline,
  WA_ICAINSTLTRHEADER-CAINSTALLMENTPLANENDDATE, sy-vline,
  WA_ICAINSTLTRHEADER-CANUMBEROFINSTALLMENTS, sy-vline,
  WA_ICAINSTLTRHEADER-CONTRACTACCOUNTNAME, sy-vline,
  WA_ICAINSTLTRHEADER-CONTRACTACCOUNT, sy-vline,
  WA_ICAINSTLTRHEADER-CACONTRACT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICAINSTLTRHEADER 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_ICAINSTLTRHEADER 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_ICAINSTLTRHEADER INTO WA_ICAINSTLTRHEADER.


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

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

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

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

*Conversion exit ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_ICAINSTLTRHEADER-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICAINSTLTRHEADER-LANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field COUNTY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICAINSTLTRHEADER-COUNTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICAINSTLTRHEADER-COUNTY.
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_ICAINSTLTRHEADER_STR, 
MANDT TYPE STRING,
CAINSTALLMENTPLAN TYPE STRING,
BUSINESSPARTNER TYPE STRING,
CACORRESPONDENCE TYPE STRING,
CACORRESPONDENCETYPE TYPE STRING,
CAINSTALLMENTPLANSTARTDATE TYPE STRING,
CAINSTALLMENTPLANENDDATE TYPE STRING,
CANUMBEROFINSTALLMENTS TYPE STRING,
CONTRACTACCOUNTNAME TYPE STRING,
CONTRACTACCOUNT TYPE STRING,
CACONTRACT TYPE STRING,
CORRESPONDENCEISSUEDATE TYPE STRING,
COMPANYCODE TYPE STRING,
LANGUAGE TYPE STRING,
POBOXLOBBYNAME TYPE STRING,
DELIVERYSERVICETYPECODE TYPE STRING,
DELIVERYSERVICENUMBER TYPE STRING,
COUNTY TYPE STRING,
COUNTYNAME TYPE STRING,
ISNOTCONTRACTUALLYCAPABLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICAINSTLTRHEADER_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_ICAINSTLTRHEADER_STR-MANDT sy-vline 
WA_ICAINSTLTRHEADER_STR-CAINSTALLMENTPLAN sy-vline 
WA_ICAINSTLTRHEADER_STR-BUSINESSPARTNER sy-vline 
WA_ICAINSTLTRHEADER_STR-CACORRESPONDENCE sy-vline 
WA_ICAINSTLTRHEADER_STR-CACORRESPONDENCETYPE sy-vline 
WA_ICAINSTLTRHEADER_STR-CAINSTALLMENTPLANSTARTDATE sy-vline 
WA_ICAINSTLTRHEADER_STR-CAINSTALLMENTPLANENDDATE sy-vline 
WA_ICAINSTLTRHEADER_STR-CANUMBEROFINSTALLMENTS sy-vline 
WA_ICAINSTLTRHEADER_STR-CONTRACTACCOUNTNAME sy-vline 
WA_ICAINSTLTRHEADER_STR-CONTRACTACCOUNT sy-vline 
WA_ICAINSTLTRHEADER_STR-CACONTRACT sy-vline 
WA_ICAINSTLTRHEADER_STR-CORRESPONDENCEISSUEDATE sy-vline 
WA_ICAINSTLTRHEADER_STR-COMPANYCODE sy-vline 
WA_ICAINSTLTRHEADER_STR-LANGUAGE sy-vline 
WA_ICAINSTLTRHEADER_STR-POBOXLOBBYNAME sy-vline 
WA_ICAINSTLTRHEADER_STR-DELIVERYSERVICETYPECODE sy-vline 
WA_ICAINSTLTRHEADER_STR-DELIVERYSERVICENUMBER sy-vline 
WA_ICAINSTLTRHEADER_STR-COUNTY sy-vline 
WA_ICAINSTLTRHEADER_STR-COUNTYNAME sy-vline 
WA_ICAINSTLTRHEADER_STR-ISNOTCONTRACTUALLYCAPABLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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