Unable to find all workitems listed in "Add workitem&qu

Hi,

This is regarding a problem in the workitem list display on right click and select "Add Workitem" in RTC plans.

User is part of the team area and the project area, has all privileges in the project.

When the person opens the RTC plan, on right clicking and selecting "Add new workitem" not all workitem types are listed(Only the top level plan items are listed). The same is the display even when tried from the web,
All other users find all options on right clicking in the plan.
Opening it in new workspace also doesn't help.

Has anyone faced this anytime? Any suggestions on why it doesn't list all options ?

Regards,
Pavithra