ABAP Select data from SAP table ATP_MATERIAL_RES_REQUIREMENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ATP_MATERIAL_RES_REQUIREMENT
*  INTO TABLE @DATA(IT_ATP_MATERIAL_RES_REQUIREMENT2).
*--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_ATP_MATERIAL_RES_REQUIREMENT INDEX 1 INTO DATA(WA_ATP_MATERIAL_RES_REQUIREMENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ATP_MATERIAL_RES_REQUIREMENT>-RESERVATIONDOCUMENT = 1.
<ATP_MATERIAL_RES_REQUIREMENT>-RESERVATIONDOCUMENTITEM = 1.
<ATP_MATERIAL_RES_REQUIREMENT>-ATPCHECKPROCESSINGSQNCPOSITION = 1.
<ATP_MATERIAL_RES_REQUIREMENT>-PRODUCT = 1.
<ATP_MATERIAL_RES_REQUIREMENT>-SUPPLYINGPLANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ATP_MATERIAL_RES_REQUIREMENT-SUPPLYINGMRPAREA, sy-vline,
  WA_ATP_MATERIAL_RES_REQUIREMENT-INVENTORYSPECIALSTOCKTYPE, sy-vline,
  WA_ATP_MATERIAL_RES_REQUIREMENT-SUPPLYINGSTORAGELOCATION, sy-vline,
  WA_ATP_MATERIAL_RES_REQUIREMENT-BATCH, sy-vline,
  WA_ATP_MATERIAL_RES_REQUIREMENT-SEGMENTATIONVALUE, sy-vline,
  WA_ATP_MATERIAL_RES_REQUIREMENT-ASSGDATPRELEVANTDOCCATEGORY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ATP_MATERIAL_RES_REQUIREMENT 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_ATP_MATERIAL_RES_REQUIREMENT 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_ATP_MATERIAL_RES_REQUIREMENT INTO WA_ATP_MATERIAL_RES_REQUIREMENT.


*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 PRODUCT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ATP_MATERIAL_RES_REQUIREMENT-PRODUCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ATP_MATERIAL_RES_REQUIREMENT-PRODUCT.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field BASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ATP_MATERIAL_RES_REQUIREMENT-BASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ATP_MATERIAL_RES_REQUIREMENT-BASEUNIT.
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_ATP_MATERIAL_RES_REQUIREMENT_STR, 
RESERVATIONDOCUMENT TYPE STRING,
RESERVATIONDOCUMENTITEM TYPE STRING,
ATPCHECKPROCESSINGSQNCPOSITION TYPE STRING,
PRODUCT TYPE STRING,
SUPPLYINGPLANT TYPE STRING,
SUPPLYINGMRPAREA TYPE STRING,
INVENTORYSPECIALSTOCKTYPE TYPE STRING,
SUPPLYINGSTORAGELOCATION TYPE STRING,
BATCH TYPE STRING,
SEGMENTATIONVALUE TYPE STRING,
ASSGDATPRELEVANTDOCCATEGORY TYPE STRING,
ASSIGNEDATPRELEVANTDOCUMENT TYPE STRING,
ASSGDATPRELEVANTDOCUMENTITEM TYPE STRING,
ASSIGNEDWBSELEMENTINTERNALID TYPE STRING,
ASSIGNEDSUPPLIER TYPE STRING,
ASSIGNEDCUSTOMER TYPE STRING,
SUPPLIER TYPE STRING,
REQDPRODAVAILABILITYUTCDATETME TYPE STRING,
REQDPRODAVAILABILITYTIMEZONE TYPE STRING,
REQUESTEDQUANTITYINBASEUNIT TYPE STRING,
BASEUNIT TYPE STRING,
CHECKINGRULE TYPE STRING,
OPERATION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ATP_MATERIAL_RES_REQUIREMENT_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_ATP_MATERIAL_RES_REQUIREMENT_STR-RESERVATIONDOCUMENT sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-RESERVATIONDOCUMENTITEM sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ATPCHECKPROCESSINGSQNCPOSITION sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-PRODUCT sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-SUPPLYINGPLANT sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-SUPPLYINGMRPAREA sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-INVENTORYSPECIALSTOCKTYPE sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-SUPPLYINGSTORAGELOCATION sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-BATCH sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-SEGMENTATIONVALUE sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ASSGDATPRELEVANTDOCCATEGORY sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ASSIGNEDATPRELEVANTDOCUMENT sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ASSGDATPRELEVANTDOCUMENTITEM sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ASSIGNEDWBSELEMENTINTERNALID sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ASSIGNEDSUPPLIER sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-ASSIGNEDCUSTOMER sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-SUPPLIER sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-REQDPRODAVAILABILITYUTCDATETME sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-REQDPRODAVAILABILITYTIMEZONE sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-REQUESTEDQUANTITYINBASEUNIT sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-BASEUNIT sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-CHECKINGRULE sy-vline 
WA_ATP_MATERIAL_RES_REQUIREMENT_STR-OPERATION sy-vline      INTO ld_text SEPARATED BY SPACE.

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