Work Item: Templates with approvals not working.

Using RTC 3.0.1.3
I created some work item template with approval but found tat I could not create work items from such template.

Steps I used:
1 Create a task
2. add Approval, but do not add any approver to the task
3. save the task
4. Create a new WI template base on the above created task
5 attempt to create another WI based on the above WI template
6. Got error message after click on Finish:
"Cannot create work item specified by template. Illegal Workitem specification! Attribute "approvals" cannot be parsed

Is this a bug?