Oracle Apps 11i - MTL_SYSTEM_ITEMS - Unable to Update

Question

Hello Experts,
In Oracle Apps11i , when i am trying to run this PL/SQL block it is not updating the table column.
BEGIN
    FOR cur
    IN (SELECT     DISTINCT msi.inventory_item_id, clpt.item_no
                                ,clpt.list_value
         FROM      temp clpt
                  ,mtl_system_items msi
         WHERE     clpt.item_no = msi.segment1
               AND organization_id IN (222,223))
    LOOP
        UPDATE    mtl_system_items_b
        SET        list_price_per_unit     = cur.list_value
        WHERE          segment1 = cur.item_no
                    AND inventory_item_id = cur.inventory_item_id
                    AND organization_id IN (222,223);
    END LOOP;
    COMMIT;
exception
when others then
dbms_output.put_line(sqlerrm);
END;Moreover i tried printing SQL%rowcount too.... it shows as rows updated "1"...whereas not commited inside DB :(
whereas when i am running direct update query, it is getting updated successfully.
        UPDATE    mtl_system_items_b
        SET        list_price_per_unit     = 25
        WHERE          segment1 = 'DFS30300'
                    AND inventory_item_id = 3
                    AND organization_id IN (222,223);This table is directly created in APPS schema. So no issue with table creation.
Please help....
Thanks...

Answer 1

Thanks Sandeep for your reply.
1) Yes i have organization apart from 222 and 223. It is controlled at org. level
2) If i do a SELECT, am getting the exact values present in both the tables. i.e TEMP table has the same value and MTL_SYSTEM_ITEMS_B remains old value
3) Big Thanks for the query, yes the method which you specify will faster the query.
Since simple cursor FOR loop does the logic, so i have implemented in that fashion.
But besides this, i doubt on below point.
I ran this query to make sure that whether the table has some kind of lock. To my surprise, i found 3 locks been set on MTL_SYSTEM_ITEMS_B table.
I have removed two locks with the below command:-
ALTER SYSTEM KILL SESSION '12,26231';
ALTER SYSTEM KILL SESSION '223,13069';Whereas there is one lock still exists on the table and am unable to release it.
ALTER SYSTEM KILL SESSION '20,14215';It throws the following message:-
ERROR at line 1:
ORA-00031: session marked for killI tried with the below command too...
Alter system disconnect session '204,14215' IMMEDIATE
ERROR at line 1:
ORA-00031: session marked for killStill same result.
Guess, if i release this lock, then hopefully the command will work.
Thanks...