ABAP Select data from SAP table ACE_S4_CURR_CONV_STRUCTRURE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ACE_S4_CURR_CONV_STRUCTRURE 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 ACE_S4_CURR_CONV_STRUCTRURE. 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 ACE_S4_CURR_CONV_STRUCTRURE 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_ACE_S4_CURR_CONV_STRUCTRURE TYPE STANDARD TABLE OF ACE_S4_CURR_CONV_STRUCTRURE,
      WA_ACE_S4_CURR_CONV_STRUCTRURE TYPE ACE_S4_CURR_CONV_STRUCTRURE,
      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: <ACE_S4_CURR_CONV_STRUCTRURE> TYPE ACE_S4_CURR_CONV_STRUCTRURE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ACE_S4_CURR_CONV_STRUCTRURE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ACE_S4_CURR_CONV_STRUCTRURE
  INTO TABLE IT_ACE_S4_CURR_CONV_STRUCTRURE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ACE_S4_CURR_CONV_STRUCTRURE
*  INTO TABLE @DATA(IT_ACE_S4_CURR_CONV_STRUCTRURE2).
*--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_ACE_S4_CURR_CONV_STRUCTRURE INDEX 1 INTO DATA(WA_ACE_S4_CURR_CONV_STRUCTRURE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ACE_S4_CURR_CONV_STRUCTRURE ASSIGNING <ACE_S4_CURR_CONV_STRUCTRURE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ACE_S4_CURR_CONV_STRUCTRURE>-COMP = 1.
<ACE_S4_CURR_CONV_STRUCTRURE>-LOGSYS = 1.
<ACE_S4_CURR_CONV_STRUCTRURE>-BUKRS = 1.
<ACE_S4_CURR_CONV_STRUCTRURE>-REF_KEY = 1.
<ACE_S4_CURR_CONV_STRUCTRURE>-REF_SUBKEY = 1.

ENDLOOP.

LOOP AT IT_ACE_S4_CURR_CONV_STRUCTRURE INTO WA_ACE_S4_CURR_CONV_STRUCTRURE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ACE_S4_CURR_CONV_STRUCTRURE-ITEMTYPE, sy-vline,
  WA_ACE_S4_CURR_CONV_STRUCTRURE-RLDNR, sy-vline,
  WA_ACE_S4_CURR_CONV_STRUCTRURE-RWCUR, sy-vline,
  WA_ACE_S4_CURR_CONV_STRUCTRURE-RHCUR, sy-vline,
  WA_ACE_S4_CURR_CONV_STRUCTRURE-RKCUR, sy-vline,
  WA_ACE_S4_CURR_CONV_STRUCTRURE-ROCUR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ACE_S4_CURR_CONV_STRUCTRURE 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_ACE_S4_CURR_CONV_STRUCTRURE 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_ACE_S4_CURR_CONV_STRUCTRURE INTO WA_ACE_S4_CURR_CONV_STRUCTRURE.


*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 LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ACE_S4_CURR_CONV_STRUCTRURE-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ACE_S4_CURR_CONV_STRUCTRURE-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ITEMTYPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ACE_S4_CURR_CONV_STRUCTRURE-ITEMTYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ACE_S4_CURR_CONV_STRUCTRURE-ITEMTYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ACE_S4_CURR_CONV_STRUCTRURE-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ACE_S4_CURR_CONV_STRUCTRURE-RLDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field RUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ACE_S4_CURR_CONV_STRUCTRURE-RUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ACE_S4_CURR_CONV_STRUCTRURE-RUNIT.
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_ACE_S4_CURR_CONV_STRUCTRURE_STR, 
COMP TYPE STRING,
LOGSYS TYPE STRING,
BUKRS TYPE STRING,
REF_KEY TYPE STRING,
REF_SUBKEY TYPE STRING,
ITEMTYPE TYPE STRING,
RLDNR TYPE STRING,
RWCUR TYPE STRING,
RHCUR TYPE STRING,
RKCUR TYPE STRING,
ROCUR TYPE STRING,
RVCUR TYPE STRING,
RBCUR TYPE STRING,
RCCUR TYPE STRING,
RDCUR TYPE STRING,
RECUR TYPE STRING,
RFCUR TYPE STRING,
RGCUR TYPE STRING,
WSL TYPE STRING,
HSL TYPE STRING,
KSL TYPE STRING,
OSL TYPE STRING,
VSL TYPE STRING,
BSL TYPE STRING,
CSL TYPE STRING,
DSL TYPE STRING,
ESL TYPE STRING,
FSL TYPE STRING,
GSL TYPE STRING,
RUNIT TYPE STRING,
MSL TYPE STRING,
ACRVALDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ACE_S4_CURR_CONV_STRUCTRURE_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_ACE_S4_CURR_CONV_STRUCTRURE_STR-COMP sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-LOGSYS sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-BUKRS sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-REF_KEY sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-REF_SUBKEY sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-ITEMTYPE sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RLDNR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RWCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RHCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RKCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-ROCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RVCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RBCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RCCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RDCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RECUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RFCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RGCUR sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-WSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-HSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-KSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-OSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-VSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-BSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-CSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-DSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-ESL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-FSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-GSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-RUNIT sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-MSL sy-vline 
WA_ACE_S4_CURR_CONV_STRUCTRURE_STR-ACRVALDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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