ABAP Select data from SAP table CATSMM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATSMM
*  INTO TABLE @DATA(IT_CATSMM2).
*--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_CATSMM INDEX 1 INTO DATA(WA_CATSMM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATSMM>-MANDT = 1.
<CATSMM>-COUNTER = 1.
<CATSMM>-STOKZ = 1.
<CATSMM>-PERNR = 1.
<CATSMM>-WORKDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATSMM-CATSHOURS, sy-vline,
  WA_CATSMM-BEGUZ, sy-vline,
  WA_CATSMM-ENDUZ, sy-vline,
  WA_CATSMM-LTXA1, sy-vline,
  WA_CATSMM-RKOSTL, sy-vline,
  WA_CATSMM-RPROJ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATSMM 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_CATSMM 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_CATSMM INTO WA_CATSMM.


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

*Conversion exit ABPSP, internal->external for field RPROJ
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_CATSMM-RPROJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATSMM-RPROJ.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CATSMM-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATSMM-UNIT.
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_CATSMM_STR, 
MANDT TYPE STRING,
COUNTER TYPE STRING,
STOKZ TYPE STRING,
PERNR TYPE STRING,
WORKDATE TYPE STRING,
CATSHOURS TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
LTXA1 TYPE STRING,
RKOSTL TYPE STRING,
RPROJ TYPE STRING,
RAUFNR TYPE STRING,
RKDAUF TYPE STRING,
RKDPOS TYPE STRING,
SEBELN TYPE STRING,
SEBELP TYPE STRING,
LSTNR TYPE STRING,
AUERU TYPE STRING,
BELNR TYPE STRING,
TRANSFER TYPE STRING,
CATSQUANTITY TYPE STRING,
UNIT TYPE STRING,
WORK_ITEM_ID TYPE STRING,
DUMMY_INCL_EEW_PRS_CPILS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATSMM_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_CATSMM_STR-MANDT sy-vline 
WA_CATSMM_STR-COUNTER sy-vline 
WA_CATSMM_STR-STOKZ sy-vline 
WA_CATSMM_STR-PERNR sy-vline 
WA_CATSMM_STR-WORKDATE sy-vline 
WA_CATSMM_STR-CATSHOURS sy-vline 
WA_CATSMM_STR-BEGUZ sy-vline 
WA_CATSMM_STR-ENDUZ sy-vline 
WA_CATSMM_STR-LTXA1 sy-vline 
WA_CATSMM_STR-RKOSTL sy-vline 
WA_CATSMM_STR-RPROJ sy-vline 
WA_CATSMM_STR-RAUFNR sy-vline 
WA_CATSMM_STR-RKDAUF sy-vline 
WA_CATSMM_STR-RKDPOS sy-vline 
WA_CATSMM_STR-SEBELN sy-vline 
WA_CATSMM_STR-SEBELP sy-vline 
WA_CATSMM_STR-LSTNR sy-vline 
WA_CATSMM_STR-AUERU sy-vline 
WA_CATSMM_STR-BELNR sy-vline 
WA_CATSMM_STR-TRANSFER sy-vline 
WA_CATSMM_STR-CATSQUANTITY sy-vline 
WA_CATSMM_STR-UNIT sy-vline 
WA_CATSMM_STR-WORK_ITEM_ID sy-vline 
WA_CATSMM_STR-DUMMY_INCL_EEW_PRS_CPILS sy-vline      INTO ld_text SEPARATED BY SPACE.

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