This was a bug reported a while back, sounds like they haven't fixed it yet.

The easy work around, split the entry into two lines on the Sch B.  Put the home state amount on one line, and the out-of-state amount on another line.  The "out-of-state" interest gets entered as 100% "XX" state.  That should get you where you need to be on the state return without having to override anything.

Rick