There are times where a calculated link may not be desired and you should be able to disable or remote this association within WIndchill.
Parts displayed on drawings automatically get a calculated link.
One example we've had in the past is an ID tag. The ID tag has it's own drawing, but we've had cases where a person would put the ID tag itself on a drawing where the tag is being used. This means the ID tag gets an extra calculated link for everywhere it's shown. While this one case can be dealt with a best practice, another case is related to another product idea I posted allowing family table instances to be related to a drawing through a "family calculated link" which may want to be removed as well.
In general it is nice if anything automatically created can be reversed manually, especially when the UI already exists for it (10.1)