How can I eliminate this error message - "Filter name cannot have one or more of the following characters :"

My Workspace/configuration is in ProjectWise. It is actually setup for Open Roads Designed, but I get this message in both MicroStation or ORD in the sorkspace/workset.

I am assuming it is a level filter, except if I open the DGNLIB with our Level Filters, I do not get the message. And no filter names seem odd.