I've found that it's possible for a user to create an attachment to an artifact (e.g. UseCase), and they decide that the UseCase isn't applicable anymore so they delete the UseCase or UseCaseGroup object. The attachment remains in the list of available attachments on the server, but if they decide to delete that attachment from the server they get a popup that states it's still attached to an artifact, but no detail as to which one. They go scroll through all the artifacts and nothing active has it attached, so then it's a bit of a chase through the database to re-enable the UseCaseGroup and/or UseCase to remove the attachment link, then re-delete the UseCase and/or UseCaseGroup to get things back in order before being able to delete the attachment from the list of available attachments.

That being said, it would be really nice if the popup message contained the name of the group/folder/item that contained the link, so that it could be quickly ascertained which Group/Item needs to be modified to remedy the situation.