Red Rag --
In some organizations,they permit only the Project Management Office staff
to baseline projects and forbid the project managers from doing so. If this
is your organization's methodology, you can prevent the PM's from baselining
their projects by setting the Save Baseline permission to Deny in the
Project Managers group. You would also need to add your PMO staff members
to the Portfolio Managers group and set the Save Baseline permission for
this Group to Allow.
Other than this, there is no way to prevent project managers from saving or
resaving a baseline. Therefore, if the first paragraph is not the solution
you seek, you should make this a training and performance issue with your
project managers. Hope this helps.