How do you clear a field?

Hi Everyone,
Can you tell me how to clear the contents of a field? For example the field is called :p2_file_name. The intent is to clear the field after the user clicks a Submit button.
Thanks.
Emad

You can do it easily in a computation
Just make a computation for the item as a static assignment and leave the value blank.
You can also do it in a page process
if you are executing a plsql block
begin
--do some stuff in my block
--set the item to null
:P2_ITEM_NAME := null;
end;

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    hi
    hope it will help you.
    Reward if help.
    REPORT zpo_bapi_purchord_tej.
    DATA DECLARATIONS *
    TYPE-POOLS slis.
    TYPES: BEGIN OF ty_table,
    v_legacy(8),
    vendor TYPE bapimepoheader-vendor,
    purch_org TYPE bapimepoheader-purch_org,
    pur_group TYPE bapimepoheader-pur_group,
    material TYPE bapimepoitem-material,
    quantity(13),
    delivery_date TYPE bapimeposchedule-delivery_date,
    net_price(23),
    plant TYPE bapimepoitem-plant,
    END OF ty_table.
    TYPES: BEGIN OF ty_alv,
    v_legs(8),
    success(10),
    v_legf(8),
    END OF ty_alv.
    TYPES: BEGIN OF ty_alv1,
    v_legf1(8),
    v_msg(500),
    END OF ty_alv1.
    *-----Work area declarations.
    DATA: x_table TYPE ty_table,
    x_header TYPE bapimepoheader,
    x_headerx TYPE bapimepoheaderx,
    x_item TYPE bapimepoitem,
    x_itemx TYPE bapimepoitemx,
    x_sched TYPE bapimeposchedule,
    x_schedx TYPE bapimeposchedulx,
    x_commatable(255),
    x_alv TYPE ty_alv,
    x_alv1 TYPE ty_alv1,
    x_alv2 TYPE ty_alv1.
    *-----Internal table declarations.
    DATA: it_table TYPE TABLE OF ty_table,
    it_commatable LIKE TABLE OF x_commatable,
    it_item TYPE TABLE OF bapimepoitem,
    it_itemx TYPE TABLE OF bapimepoitemx,
    it_sched TYPE TABLE OF bapimeposchedule,
    it_schedx TYPE TABLE OF bapimeposchedulx,
    it_alv TYPE TABLE OF ty_alv,
    it_alv1 TYPE TABLE OF ty_alv1,
    it_alv2 TYPE TABLE OF ty_alv1.
    DATA: po_number TYPE bapimepoheader-po_number,
    x_return TYPE bapiret2,
    it_return TYPE TABLE OF bapiret2,
    v_file TYPE string,
    v_temp(8),
    v_succsount TYPE i VALUE 0,
    v_failcount TYPE i VALUE 0,
    v_total TYPE i.
    DATA: v_temp1(5) TYPE n VALUE 0.
    DATA: x_event TYPE slis_t_event,
    x_fieldcat TYPE slis_t_fieldcat_alv,
    x_list_header TYPE slis_t_listheader,
    x_event1 LIKE LINE OF x_event,
    x_layout1 TYPE slis_layout_alv,
    x_variant1 TYPE disvariant,
    x_repid2 LIKE sy-repid.
    DATA : it_fieldcat TYPE TABLE OF slis_t_fieldcat_alv.
    SELECTION-SCREEN *
    SELECTION-SCREEN BEGIN OF BLOCK v_b1 WITH FRAME.
    *-----To fetch the flat file.
    PARAMETERS: p_file TYPE rlgrap-filename.
    SELECTION-SCREEN END OF BLOCK v_b1.
    AT SELECTION-SCREEN *
    AT SELECTION-SCREEN.
    IF p_file IS INITIAL.
    MESSAGE text-001 TYPE 'E'.
    ENDIF.
    AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
    *-----To use F4 help to find file path.
    CALL FUNCTION 'F4_FILENAME'
    EXPORTING
    program_name = syst-cprog
    dynpro_number = syst-dynnr
    IMPORTING
    file_name = p_file.
    v_file = p_file.
    START-OF-SELECTION *
    START-OF-SELECTION.
    PERFORM gui_upload.
    LOOP AT it_table INTO x_table.
    PERFORM header_details.
    v_temp = x_table-v_legacy.
    LOOP AT it_table INTO x_table WHERE v_legacy = v_temp.
    PERFORM lineitem.
    PERFORM schedule.
    ENDLOOP.
    DELETE it_table WHERE v_legacy = v_temp.
    PERFORM bapicall.
    MOVE po_number TO x_alv-success.
    APPEND x_alv TO it_alv.
    CLEAR x_alv.
    *-----To clear the item details in internal table after the operation for a header.
    REFRESH: it_item,
    it_itemx,
    it_sched,
    it_schedx.
    CLEAR: v_temp1.
    ENDLOOP.
    v_total = v_succsount + v_failcount.
    PERFORM display_alv.
    FORM GUI_UPLOAD *
    FORM gui_upload .
    CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
    filename = v_file
    filetype = 'ASC'
    TABLES
    data_tab = it_commatable
    EXCEPTIONS
    file_open_error = 1
    file_read_error = 2
    no_batch = 3
    gui_refuse_filetransfer = 4
    invalid_type = 5
    no_authority = 6
    unknown_error = 7
    bad_data_format = 8
    header_not_allowed = 9
    separator_not_allowed = 10
    header_too_long = 11
    unknown_dp_error = 12
    access_denied = 13
    dp_out_of_memory = 14
    disk_full = 15
    dp_timeout = 16
    OTHERS = 17
    IF sy-subrc = 0.
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    LOOP AT it_commatable INTO x_commatable.
    IF x_commatable IS NOT INITIAL.
    SPLIT x_commatable AT ',' INTO
    x_table-v_legacy
    x_table-vendor
    x_table-purch_org
    x_table-pur_group
    x_table-material
    x_table-quantity
    x_table-delivery_date
    x_table-net_price
    x_table-plant.
    APPEND x_table TO it_table.
    ENDIF.
    CLEAR x_table.
    ENDLOOP.
    ENDIF.
    ENDFORM. " gui_upload
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    FORM header_details .
    MOVE 'NB' TO x_header-doc_type.
    CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
    input = x_table-vendor
    IMPORTING
    output = x_table-vendor
    MOVE x_table-vendor TO x_header-vendor.
    MOVE x_table-purch_org TO x_header-purch_org.
    MOVE x_table-pur_group TO x_header-pur_group.
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    x_headerx-vendor = 'X'.
    x_headerx-purch_org = 'X'.
    x_headerx-pur_group = 'X'.
    ENDFORM. " header_details
    FORM LINEITEM *
    FORM lineitem .
    v_temp1 = v_temp1 + 10.
    CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
    input = v_temp1
    IMPORTING
    output = v_temp1.
    MOVE v_temp1 TO x_item-po_item.
    CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
    input = x_table-material
    IMPORTING
    output = x_table-material.
    MOVE x_table-material TO x_item-material.
    MOVE x_table-quantity TO x_item-quantity.
    MOVE x_table-net_price TO x_item-net_price.
    MOVE x_table-plant TO x_item-plant.
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    x_itemx-material = 'X'.
    x_itemx-quantity = 'X'.
    x_itemx-net_price = 'X'.
    x_itemx-plant = 'X'.
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    APPEND x_itemx TO it_itemx.
    CLEAR: x_item, x_itemx.
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    FORM schedule .
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    MOVE v_temp1 TO x_sched-po_item.
    x_schedx-delivery_date = 'X'.
    x_schedx-po_item = v_temp1.
    APPEND x_sched TO it_sched.
    APPEND x_schedx TO it_schedx.
    CLEAR: x_sched, x_schedx.
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    FORM bapicall .
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    poheader = x_header
    poheaderx = x_headerx
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    exppurchaseorder = po_number
    TABLES
    return = it_return
    poitem = it_item
    poitemx = it_itemx
    poschedule = it_sched
    poschedulex = it_schedx.
    IF po_number IS NOT INITIAL.
    v_succsount = v_succsount + 1.
    MOVE x_table-v_legacy TO x_alv-v_legs.
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    v_failcount = v_failcount + 1.
    MOVE x_table-v_legacy TO x_alv-v_legf.
    MOVE x_table-v_legacy TO x_alv1-v_legf1.
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    IF x_alv1-v_msg IS INITIAL.
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    CONCATENATE x_alv1-v_msg x_return-message INTO x_alv1-v_msg SEPARATED BY space.
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    ENDLOOP.
    APPEND x_alv1 TO it_alv1.
    CLEAR x_alv1.
    ENDIF.
    ENDFORM. " bapicall
    FORM DISPLAY_ALV *
    FORM display_alv .
    PERFORM x_list_header.
    PERFORM build_fieldcat CHANGING x_fieldcat.
    x_repid2 = sy-repid.
    x_event1-name = 'TOP_OF_PAGE'.
    x_event1-form = 'TOP_OF_PAGE'.
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    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
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    is_layout = x_layout1
    it_fieldcat = x_fieldcat
    i_callback_user_command = 'USER_COMMAND'
    i_callback_top_of_page = 'TOP_OF_PAGE'
    i_save = 'A'
    is_variant = x_variant1
    it_events = x_event
    TABLES
    t_outtab = it_alv
    EXCEPTIONS
    program_error = 1
    OTHERS = 2.
    IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
    WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
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    ENDFORM. " display_master_data
    FORM USER_COMMAND *
    FORM user_command USING ucomm LIKE sy-ucomm selfield
    TYPE slis_selfield.
    READ TABLE it_alv INTO x_alv INDEX selfield-tabindex.
    CLEAR : x_alv2,it_alv2[].
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    x_alv2 = x_alv1.
    APPEND x_alv2 TO it_alv2 .
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    DATA : x3_fieldcat LIKE LINE OF it_fieldcat.
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    APPEND x3_fieldcat TO it_fieldcat.
    CLEAR x3_fieldcat.
    CLEAR x3_fieldcat.
    x3_fieldcat-col_pos = '1'.
    x3_fieldcat-fieldname = 'V_MSG'.
    x3_fieldcat-reptext_ddic = text-112.
    x3_fieldcat-ref_tabname = 'IT_ALV2'.
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    CLEAR x3_fieldcat.
    x_layout1-colwidth_optimize = 'X'.
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    it_fieldcat = it_fieldcat
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    i_callback_top_of_page = 'TOP'
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    it_events = x_event
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    ENDFORM.
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    x1_fieldcat-fieldname = 'V_LEGS'.
    x1_fieldcat-reptext_ddic = text-108.
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    x1_fieldcat-fieldname = 'SUCCESS'.
    x1_fieldcat-key = 'X'.
    x1_fieldcat-reptext_ddic = text-109.
    x1_fieldcat-ref_tabname = 'IT_ALV'.
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    x1_fieldcat-fieldname = 'V_LEGF'.
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    x1_fieldcat-reptext_ddic = text-110.
    x1_fieldcat-ref_tabname = 'IT_ALV'.
    APPEND x1_fieldcat TO et_fieldcat.
    CLEAR x1_fieldcat.
    ENDFORM. " build_fieldcat
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    CLEAR x_list_header1 .
    x_list_header1-typ = 'H'.
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    APPEND x_list_header1 TO x_list_header.
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    x_list_header1-typ = 'S'.
    x_list_header1-key = text-106.
    x_list_header1-info = v_total.
    APPEND x_list_header1 TO x_list_header.
    *-----List Key: Type S
    CLEAR x_list_header1 .
    x_list_header1-typ = 'S'.
    x_list_header1-key = text-107.
    x_list_header1-info = v_succsount.
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    FORM TOP_OF_PAGE *
    FORM top_of_page.
    CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
    EXPORTING
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