De-activate ChaRM

I am trying to clean-up Solution Manager Projects. When I try to delete one of the projects, I get the message "Project ZKATCHARM is already used in Change Request Management." So I went into the Change Requests tab under System Landscape. The "Activate Change Request Management" check-box is checked and the selection is grayed-out so I am unable to uncheck the box to disable ChaRM. I have also tried to click on "Show Task List" to see what tasks the project is expecting to be executed but the Task List is not being generated. The consultant who created this project is no longer here so I am unable to ask him what was done during creation. Does anyone have any suggestions on how I might be able to de-activate ChaRM and delete this project? Thanks