Refinement: Saving not possible
When a refinement for a component is created and you delete the
component, the values from the refinement are not deleted. Hence, the
model is invalid and cannot be saved any more, until also the refinement
is deleted.
I think it exists the same problem for renaming ports.
(from redmine: issue id 2040, created on 2014-07-01, closed on 2015-07-02)