I've added that status string to the Status validation list on both ApprovalVoteTracking as well as FRS_MyItems Business objects and it works just fine. Can you double check these have the exact same string? Even a different ASCII character like a short dash vs a long dash could throw this off and cause this error.
If you are still having trouble can you give us screenshots of both your validation list's values dialog?
Thanks Jon. I was able to solve it.