ABAP Select data from SAP table ISTLDOCHDR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISTLDOCHDR
*  INTO TABLE @DATA(IT_ISTLDOCHDR2).
*--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_ISTLDOCHDR INDEX 1 INTO DATA(WA_ISTLDOCHDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISTLDOCHDR>-MANDT = 1.
<ISTLDOCHDR>-SETTLEMENTDOCHEADERUUID = 1.
<ISTLDOCHDR>-SETTLMTDOC = 1.
<ISTLDOCHDR>-SETTLMTDOCYEAR = 1.
<ISTLDOCHDR>-CONTRACTAPPLICATIONUUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISTLDOCHDR-CONTRACTAPPLICATIONVERSION, sy-vline,
  WA_ISTLDOCHDR-ACMSETTLEMENTDOCUMENTTYPE, sy-vline,
  WA_ISTLDOCHDR-ACMREFERENCESETTLEMENTCATEGORY, sy-vline,
  WA_ISTLDOCHDR-SETTLEMENTSCENARIO, sy-vline,
  WA_ISTLDOCHDR-SIDE, sy-vline,
  WA_ISTLDOCHDR-TRADINGCONTRACTNUMBER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISTLDOCHDR 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_ISTLDOCHDR 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_ISTLDOCHDR INTO WA_ISTLDOCHDR.


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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field REFERENCEPAYER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISTLDOCHDR-REFERENCEPAYER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISTLDOCHDR-REFERENCEPAYER.
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_ISTLDOCHDR_STR, 
MANDT TYPE STRING,
SETTLEMENTDOCHEADERUUID TYPE STRING,
SETTLMTDOC TYPE STRING,
SETTLMTDOCYEAR TYPE STRING,
CONTRACTAPPLICATIONUUID TYPE STRING,
CONTRACTAPPLICATIONVERSION TYPE STRING,
ACMSETTLEMENTDOCUMENTTYPE TYPE STRING,
ACMREFERENCESETTLEMENTCATEGORY TYPE STRING,
SETTLEMENTSCENARIO TYPE STRING,
SIDE TYPE STRING,
TRADINGCONTRACTNUMBER TYPE STRING,
TRADINGCONTRACTITEM TYPE STRING,
ABDNUMBER TYPE STRING,
SETTLEMENTPOSTINGDATE TYPE STRING,
CONTRACTAPPLICATIONDOCUMENT TYPE STRING,
SUCCESSORITEM TYPE STRING,
SOLDTOPARTY TYPE STRING,
PAYERPARTY TYPE STRING,
BILLTOPARTY TYPE STRING,
REFERENCEVENDOR TYPE STRING,
REFERENCEPAYER TYPE STRING,
CUSTOMERCOUNTRYKEY TYPE STRING,
REGION TYPE STRING,
SETTLEMENTCURRENCY TYPE STRING,
ACMSETTLEMENTUNITGROSSAMOUNT TYPE STRING,
ACMSETTLEMENTUNITNETAMOUNT TYPE STRING,
THRESHOLDPERCENTAGE TYPE STRING,
DPQSINSETTLEMENTINDICATOR TYPE STRING,
ACMSETTLEMENTUNITISIGNOREDPQS TYPE STRING,
ACMSETTLMTISFNLSEPARATEINVCFEE TYPE STRING,
ACMSETTLMTISPRVSNLPOSTGACTIVE TYPE STRING,
APPLITEMCREATEDONDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISTLDOCHDR_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_ISTLDOCHDR_STR-MANDT sy-vline 
WA_ISTLDOCHDR_STR-SETTLEMENTDOCHEADERUUID sy-vline 
WA_ISTLDOCHDR_STR-SETTLMTDOC sy-vline 
WA_ISTLDOCHDR_STR-SETTLMTDOCYEAR sy-vline 
WA_ISTLDOCHDR_STR-CONTRACTAPPLICATIONUUID sy-vline 
WA_ISTLDOCHDR_STR-CONTRACTAPPLICATIONVERSION sy-vline 
WA_ISTLDOCHDR_STR-ACMSETTLEMENTDOCUMENTTYPE sy-vline 
WA_ISTLDOCHDR_STR-ACMREFERENCESETTLEMENTCATEGORY sy-vline 
WA_ISTLDOCHDR_STR-SETTLEMENTSCENARIO sy-vline 
WA_ISTLDOCHDR_STR-SIDE sy-vline 
WA_ISTLDOCHDR_STR-TRADINGCONTRACTNUMBER sy-vline 
WA_ISTLDOCHDR_STR-TRADINGCONTRACTITEM sy-vline 
WA_ISTLDOCHDR_STR-ABDNUMBER sy-vline 
WA_ISTLDOCHDR_STR-SETTLEMENTPOSTINGDATE sy-vline 
WA_ISTLDOCHDR_STR-CONTRACTAPPLICATIONDOCUMENT sy-vline 
WA_ISTLDOCHDR_STR-SUCCESSORITEM sy-vline 
WA_ISTLDOCHDR_STR-SOLDTOPARTY sy-vline 
WA_ISTLDOCHDR_STR-PAYERPARTY sy-vline 
WA_ISTLDOCHDR_STR-BILLTOPARTY sy-vline 
WA_ISTLDOCHDR_STR-REFERENCEVENDOR sy-vline 
WA_ISTLDOCHDR_STR-REFERENCEPAYER sy-vline 
WA_ISTLDOCHDR_STR-CUSTOMERCOUNTRYKEY sy-vline 
WA_ISTLDOCHDR_STR-REGION sy-vline 
WA_ISTLDOCHDR_STR-SETTLEMENTCURRENCY sy-vline 
WA_ISTLDOCHDR_STR-ACMSETTLEMENTUNITGROSSAMOUNT sy-vline 
WA_ISTLDOCHDR_STR-ACMSETTLEMENTUNITNETAMOUNT sy-vline 
WA_ISTLDOCHDR_STR-THRESHOLDPERCENTAGE sy-vline 
WA_ISTLDOCHDR_STR-DPQSINSETTLEMENTINDICATOR sy-vline 
WA_ISTLDOCHDR_STR-ACMSETTLEMENTUNITISIGNOREDPQS sy-vline 
WA_ISTLDOCHDR_STR-ACMSETTLMTISFNLSEPARATEINVCFEE sy-vline 
WA_ISTLDOCHDR_STR-ACMSETTLMTISPRVSNLPOSTGACTIVE sy-vline 
WA_ISTLDOCHDR_STR-APPLITEMCREATEDONDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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