How to set defalut value to DB current date time in EO using sql

HI,
I am using below query to set default date time as DB current date
select to_char(sysdate, 'DD-MM-YYYY HH24:MI:SS') from dual
but it is throwing exception
(oracle.jbo.AttributeLoadException) JBO-27021: Failed to load custom data type value at index 7 with java object of type oracle.jbo.domain.Timestamp due to java.sql.SQLException.

Halo,
I tested it & was able to find the values inserted in db in hiredate column.. What is that you did? Was this..
In EO of emp -- Hire date column of datatype timestamp :
details tab.. Default value -- expression :
DBTransaction.currentDbTimeIf you would have done this,
On run time when we click createInsert button , by default you will see the date.. After committing the changes, query it in db and will find the inserted record with default value..
Sample data i tested :
SQL Statement which produced this data:
select * from emp where empno=1111
EMPNO,ENAME,JOB,MGR,HIREDATE,SAL,COMM,DEPTNO
1111,null,null,null,06/05/2013 17:18:41,4500,null,nullRegards,
Archana

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