ABAP Select data from SAP table COHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COHEADER
*  INTO TABLE @DATA(IT_COHEADER2).
*--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_COHEADER INDEX 1 INTO DATA(WA_COHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COHEADER>-KOKRS = 1.
<COHEADER>-BELNR = 1.
<COHEADER>-VERSN = 1.
<COHEADER>-PERIO = 1.
<COHEADER>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COHEADER-BUDAT, sy-vline,
  WA_COHEADER-USNAM, sy-vline,
  WA_COHEADER-BLTXT, sy-vline,
  WA_COHEADER-BLART, sy-vline,
  WA_COHEADER-LDGRP, sy-vline,
  WA_COHEADER-COPYDOC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COHEADER 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_COHEADER 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_COHEADER INTO WA_COHEADER.


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

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

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

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

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

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

*Conversion exit GJAHR, internal->external for field VAL_GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_COHEADER-VAL_GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COHEADER-VAL_GJAHR.
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_COHEADER_STR, 
KOKRS TYPE STRING,
BELNR TYPE STRING,
VERSN TYPE STRING,
PERIO TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
USNAM TYPE STRING,
BLTXT TYPE STRING,
BLART TYPE STRING,
LDGRP TYPE STRING,
COPYDOC TYPE STRING,
WSDAT TYPE STRING,
KURST TYPE STRING,
SEND_REC_REL TYPE STRING,
GJAHR TYPE STRING,
BELNR_REV TYPE STRING,
STFLG TYPE STRING,
STOKZ TYPE STRING,
AWREF_REV TYPE STRING,
AWKEY TYPE STRING,
AWTYP TYPE STRING,
VAL_PERIO TYPE STRING,
VAL_GJAHR TYPE STRING,
CPUDT TYPE STRING,
VALDT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COHEADER_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_COHEADER_STR-KOKRS sy-vline 
WA_COHEADER_STR-BELNR sy-vline 
WA_COHEADER_STR-VERSN sy-vline 
WA_COHEADER_STR-PERIO sy-vline 
WA_COHEADER_STR-BLDAT sy-vline 
WA_COHEADER_STR-BUDAT sy-vline 
WA_COHEADER_STR-USNAM sy-vline 
WA_COHEADER_STR-BLTXT sy-vline 
WA_COHEADER_STR-BLART sy-vline 
WA_COHEADER_STR-LDGRP sy-vline 
WA_COHEADER_STR-COPYDOC sy-vline 
WA_COHEADER_STR-WSDAT sy-vline 
WA_COHEADER_STR-KURST sy-vline 
WA_COHEADER_STR-SEND_REC_REL sy-vline 
WA_COHEADER_STR-GJAHR sy-vline 
WA_COHEADER_STR-BELNR_REV sy-vline 
WA_COHEADER_STR-STFLG sy-vline 
WA_COHEADER_STR-STOKZ sy-vline 
WA_COHEADER_STR-AWREF_REV sy-vline 
WA_COHEADER_STR-AWKEY sy-vline 
WA_COHEADER_STR-AWTYP sy-vline 
WA_COHEADER_STR-VAL_PERIO sy-vline 
WA_COHEADER_STR-VAL_GJAHR sy-vline 
WA_COHEADER_STR-CPUDT sy-vline 
WA_COHEADER_STR-VALDT sy-vline      INTO ld_text SEPARATED BY SPACE.

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