How to link IT2003 - IT2005 in Time Management?

Dear all,

I'm facing a problem in Time management: My employee is assigned an Work schedule in IT0007.

Follow the WS, on 14.10.2011, he has to work from 08:00 AM to 17:00 PM. But there is a changing of shift on that day.

I create a new record in IT2003 to change his shift from: 13:00 PM to 21:00 PM. But when I create an Overtime hour in IT2005 from 09:00 AM to 11:00 AM, the system show the error: "Overtime overlaps with working time or core time, was therefore delimited".

How do I change the working time and also input the overtime for the EE? Is there any way to link the IT2003 and IT2005?

Any suggestion will be appreciated,

Thanks,

Khiem Nguyen.