Activate a trigger when a textfield is focused

Hello all,
I have a textfield and I want to execute a procedure when that textfield is focused. I want to do this by using the keyboard and not the mouse.
For example when I am at a textfield called X, I want to press the Tab button and move to textfield Z. Then I want my procedure to get executed.
Which trigger do I have to use?
Thank you

I read the initial problem :
"I have a textfield and I want to execute a procedure when that textfield is focused"
and I bet, that he needs the feature too, when he enter the Item via "Next_Item", "Previous_Item", "Next_Record", "Previous_Record", "Next_Block", "Previous_Block", ...
these are the classical problems, when navigating to an item, when the developer thinks, that the user typically goes to that item via TAB. But after the first tests he learns, that SHIFT-TAB and all the other shortcuts described above have to work too.
At that point it's much better to use a WNII than Key-Triggers
Gerd

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Steve's tip is the only good solution for this case.
The problem in your case for example is:
Let's say you have a block-trigger, which fires after your execute-trigger.
Now a colleague of you, which don't know your code, create a WHEN-BUTTON-PRESSED on an item, then the new code is started and not the block-trigger-code.
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hi,
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create or replace
TRIGGER TOP_RCV_TRANSACTION_ACC_T2 AFTER
INSERT ON PO.RCV_TRANSACTIONS FOR EACH ROW DECLARE
CURSOR org_item_cur
IS
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      FROM rcv_shipment_lines
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      select distinct RSL.item_id
from
RCV_SHIPMENT_HEADERS RSH
,RCV_shipment_lines RSL
where :new.shipment_header_id=RSH.shipment_header_id
and RSH.shipment_header_id=RSL.shipment_header_id;
X_att_item      VARCHAR2(10);
X__bc_ot        VARCHAR2(10);
X_sum_qty       NUMBER;
X_receipt_num   VARCHAR2(30);
X_count_article NUMBER;
X_item_org      NUMBER;
X_org_id        NUMBER;
X_serial_number NUMBER;
X_dec_dou varchar2(100);
X_DAE varchar2(100);
X_LOCATOR_ID NUMBER;
X_ITEM_REVISION varchar2(3);
X_ITEM_ID NUMBER ;
X_PO_NUMBER VARCHAR2(20) ;
BEGIN
FOR item_rec IN item_cur
      LOOP
IF (:new.transaction_type='DELIVER' and :new.organization_id=83 and (item_rec.item_id=61305 or item_rec.item_id=61306)) THEN
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    INTO X_receipt_num
    FROM RCV_SHIPMENT_HEADERS
    WHERE shipment_header_id=:new.shipment_header_id;
SELECT COUNT(*)
    INTO X_count_article
    FROM mtl_system_items_b
    WHERE inventory_item_id=
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      FROM rcv_shipment_lines
      WHERE shipment_line_id=:new.shipment_line_id
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    select distinct PHA.segment1
    into X_PO_NUMBER
    from PO_HEADERS_ALL PHA
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      select distinct ITEM_REVISION
      into X_ITEM_REVISION
      from rcv_shipment_lines
      WHERE shipment_line_id=:new.shipment_line_id;
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              transaction_interface_id,
              SOURCE_CODE,
              SOURCE_LINE_ID,
              SOURCE_header_ID,
              PROCESS_FLAG,
              TRANSACTION_MODE,
              INVENTORY_ITEM_ID,
              REVISION,
              ORGANIZATION_ID,
              SUBINVENTORY_CODE,
              TRANSACTION_QUANTITY,
              TRANSACTION_UOM,
              TRANSACTION_DATE,
              TRANSACTION_TYPE_ID,
              TRANSACTION_REFERENCE,
              TRANSACTION_COST,
              LAST_UPDATE_DATE,
              LAST_UPDATED_BY,
              CREATION_DATE,
              CREATED_BY,
              lock_flag,
              transaction_source_name,
              transaction_source_type_id,
              Flow_Schedule,
              Scheduled_Flag,
              distribution_account_id ,
              LOCATOR_ID
            VALUES
              mtl_transactions_interface_s.nextval,
              'INTERFACE',
              0,
              0,
              1,
              3,
              org_item_rec.inventory_item_id,
              X_ITEM_REVISION,
              161,
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              :new.uom_code,
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                :new.po_unit_price,
              sysdate,
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              2,
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              13,
              'Y',
              2,
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              :new.attribute1
        END IF;
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      if org_item_cur%ISOPEN then
        close org_item_cur;
        end if;
END IF;
END IF;
   END LOOP;
END;
please help me and give me solutions to localisate the problem?

This trigger will fire at the time of every PO receipt and receiving transactions such as Accept, Reject, Deliver, RTV etc.
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Hello,
Right now I am using 11g client side and 10g database.
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Edited by: Pooja 1985 on Feb 26, 2013 5:44 PM

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still if you not find any solution go for custom exit, means in standard program only ABAP consultant change the program where you required, it is little risk, you have to do the more testing for this
BR:
Venkat.Gurram

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Activate a trigger when a textfield is focused

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