ABAP Select data from SAP table MRM_AMCK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRM_AMCK
*  INTO TABLE @DATA(IT_MRM_AMCK2).
*--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_MRM_AMCK INDEX 1 INTO DATA(WA_MRM_AMCK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRM_AMCK>-BPMNG = 1.
<MRM_AMCK>-BPUMN = 1.
<MRM_AMCK>-BPUMZ = 1.
<MRM_AMCK>-BSMNG = 1.
<MRM_AMCK>-BUDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRM_AMCK-BUKRS, sy-vline,
  WA_MRM_AMCK-MENGE, sy-vline,
  WA_MRM_AMCK-NETWR, sy-vline,
  WA_MRM_AMCK-NOQUANTITY, sy-vline,
  WA_MRM_AMCK-REFWR, sy-vline,
  WA_MRM_AMCK-REMNG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRM_AMCK 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_MRM_AMCK 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_MRM_AMCK INTO WA_MRM_AMCK.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MRM_AMCK-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_AMCK-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRM_AMCK-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_AMCK-EBELN.
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_MRM_AMCK_STR, 
BPMNG TYPE STRING,
BPUMN TYPE STRING,
BPUMZ TYPE STRING,
BSMNG TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
MENGE TYPE STRING,
NETWR TYPE STRING,
NOQUANTITY TYPE STRING,
REFWR TYPE STRING,
REMNG TYPE STRING,
RETPO TYPE STRING,
PSTYP TYPE STRING,
SCHPR TYPE STRING,
SHKZG TYPE STRING,
TBTKZ TYPE STRING,
WAERS TYPE STRING,
WEPOS TYPE STRING,
WEUNB TYPE STRING,
WENWR TYPE STRING,
WEWWR TYPE STRING,
WRBTR TYPE STRING,
WWERT TYPE STRING,
XBPRM TYPE STRING,
XEKBZ TYPE STRING,
RBLGP TYPE STRING,
IVTYP TYPE STRING,
XCONTRACT TYPE STRING,
COMPARISON_VALUE TYPE STRING,
XUSE_COMPARISON_VALUE TYPE STRING,
ANNEX_AMOUNT TYPE STRING,
UE6_WRBTR TYPE STRING,
UE6_WRBTR_ORG TYPE STRING,
UE6_FLAG TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
BELNR TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
HWAER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRM_AMCK_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_MRM_AMCK_STR-BPMNG sy-vline 
WA_MRM_AMCK_STR-BPUMN sy-vline 
WA_MRM_AMCK_STR-BPUMZ sy-vline 
WA_MRM_AMCK_STR-BSMNG sy-vline 
WA_MRM_AMCK_STR-BUDAT sy-vline 
WA_MRM_AMCK_STR-BUKRS sy-vline 
WA_MRM_AMCK_STR-MENGE sy-vline 
WA_MRM_AMCK_STR-NETWR sy-vline 
WA_MRM_AMCK_STR-NOQUANTITY sy-vline 
WA_MRM_AMCK_STR-REFWR sy-vline 
WA_MRM_AMCK_STR-REMNG sy-vline 
WA_MRM_AMCK_STR-RETPO sy-vline 
WA_MRM_AMCK_STR-PSTYP sy-vline 
WA_MRM_AMCK_STR-SCHPR sy-vline 
WA_MRM_AMCK_STR-SHKZG sy-vline 
WA_MRM_AMCK_STR-TBTKZ sy-vline 
WA_MRM_AMCK_STR-WAERS sy-vline 
WA_MRM_AMCK_STR-WEPOS sy-vline 
WA_MRM_AMCK_STR-WEUNB sy-vline 
WA_MRM_AMCK_STR-WENWR sy-vline 
WA_MRM_AMCK_STR-WEWWR sy-vline 
WA_MRM_AMCK_STR-WRBTR sy-vline 
WA_MRM_AMCK_STR-WWERT sy-vline 
WA_MRM_AMCK_STR-XBPRM sy-vline 
WA_MRM_AMCK_STR-XEKBZ sy-vline 
WA_MRM_AMCK_STR-RBLGP sy-vline 
WA_MRM_AMCK_STR-IVTYP sy-vline 
WA_MRM_AMCK_STR-XCONTRACT sy-vline 
WA_MRM_AMCK_STR-COMPARISON_VALUE sy-vline 
WA_MRM_AMCK_STR-XUSE_COMPARISON_VALUE sy-vline 
WA_MRM_AMCK_STR-ANNEX_AMOUNT sy-vline 
WA_MRM_AMCK_STR-UE6_WRBTR sy-vline 
WA_MRM_AMCK_STR-UE6_WRBTR_ORG sy-vline 
WA_MRM_AMCK_STR-UE6_FLAG sy-vline 
WA_MRM_AMCK_STR-MATNR sy-vline 
WA_MRM_AMCK_STR-WERKS sy-vline 
WA_MRM_AMCK_STR-BELNR sy-vline 
WA_MRM_AMCK_STR-EBELN sy-vline 
WA_MRM_AMCK_STR-EBELP sy-vline 
WA_MRM_AMCK_STR-HWAER sy-vline      INTO ld_text SEPARATED BY SPACE.

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