My vault does not allow for checking in any items with references outside the vault but I keep getting pulled into issues where someone checks out an assemblies then creates a reference outside the vault and proceeds to have issues. I am hoping there is a way to run a report on this but i am not sure if it could read information from a checked out file.
Thanks
Bob
Check out this thread. I should have read that first. It appears there isn't a great way to handle your issue.
Report for External File References