SW/EPDM 2015: Can't checkin files with missing SimulationXpress studies.

We just did a Pack&Go of an old assembly on a network folder and brought the contents into our Vault. We can't check in 3 parts that are referencing a SimulationXpress study file (.cwr). These files are long gone and not important - is there anyway to force the check in or otherwise strip this reference from these files?

Thanks

SolidworksAdministration