BCS - CRUD operation on Oracle table inside SharePoint

Hello Experts,
I am using WCF application to query data in Oracle table and pulling this WCF service into SharePoint via SP Designer external content type.
I am using System.string, System.INT32 and System.DateTime to pull-in data from oracle table in WCF. For 'string' everything looks normal in SharePoint list but for int and datetime by default columns are marked REQUIRED * in SP external list.
Note: 'Required' checkbox in SP designer external content type operation is unchecked.
Can you please help me with this issue?
Thanks
Rahul
Thanks Rahul Prabhune

user4256563 wrote:
Hello.
I have this function
function InsertTable(p_object_acct IN NCHAR , p_subsidiary_acct IN NCHAR ,p_amount IN NUMBER)
RETURN NCHAR IS
BEGIN
INSERT INTO TEMP_TABLE (OBJECT_ACCT,SUBSIDIARY_ACCT,AMOUNT) VALUES (p_object_acct,p_subsidiary_acct,p_amount);
RETURN 'yeah';
END InsertTable;
When i call this table inside of my package i recieve this error
ORA-14551: cannot perform a DML operation inside a query tips
Im running in oracle 10 g
Someone know how i can do this?
make it a PROCEDURE not a FUNCTION
14551, 00000, "cannot perform a DML operation inside a query "
// *Cause: DML operation like insert, update, delete or select-for-update
//          cannot be performed inside a query or under a PDML slave.
// *Action: Ensure that the offending DML operation is not performed or
//          use an autonomous transaction to perform the DML operation within
//          the query or PDML slave.

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user620101 wrote:
I have written a procedure which copy data in to oracle tables.Other user can also start inserting in that table so to prevent these intervention.
i have applied locks on these two tables and assume that my procedure will wait for other users to finish and it will apply lock on the tables and other users will now wait till this procedure finishes.
My Procedure looks like:--
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forall .....insert in table 2.
commit;
EXCEPTION
WHEN OTHERS THEN
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END;
But my problem is i am still receiving oracle error as below and the above procedure fails in between:-
ORA-00060: deadlock detected while waiting for resource
Any hint ??But if you successfully lock TABLE1 (in session #1) and another session (session #2) is holding a lock against TABLE2 (say it's currently updating a row) then session #1 has to wait when you issue the Lock table command for table2. So session #1 is waiting, and then session #2 tries to do ANY modification to TABLE1 (which session #1 still has locked, and is still waiting to obtain the lock on TABLE2)... whamo, deadlock.
user620101 wrote:
Can we get this error if i execute a SELECT statement on some table which is not locked by me and some other other is updating/deletig/inserting in that table ?
*Select statement is without update clause.No, writes (and locks) do not block reads. So a simple select statement (unless you issued a FOR UPDATE clause) would not cause this issue.
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