ST --
Nope, that button cannot be disabled either...unfortunately. In every
version of Microsoft EPM, from Project Central to Project Server 2002, 2003,
and 2007, we have never been allowed to disabled the Delete button (called
Reject in previous versions). Because you cannot disabled the button, you
need to make this a training and performance issue with your team members
and project managers as follows:
1. Train your team members NOT to delete tasks. Instead, require them to
contact their PM in person, by phone, or by e-mail to indicate that they are
not able to perform a task, or are the wrong person assigned to the task.
2. Train your project managers to NEVER approve Delete Assignment Requests
on the Task Updates page. Stress that approving a Delete Assignment Request
will REMOVE the resource(s) from the selected task(s) with no Undo option
available.
Hope this helps.