Hi Kieran,
I saw this often in your college. For instance, the grant/funds from another institution would explicitly be for faculty salary and wouldn't cover fringe. I think you can set that up in the distribution entry to operate properly as it's occurring, but after the fact, can only be moved as a journal entry.
1. I would likely ignore the JE manual comment and use whatever AN Type makes the JE happy. Others may have better advice if they've done this type of JE recently! I don't expect most UMN training guides to be 100% informed on grant-related situations, and sometimes this sentence could be very old and not updated recently.
2. I typically did cost share the fringe, to continue showing it's related to that project, even though the project doesn't allow it as a direct cost.
Curious if other CAs have seen this and will chime in. I haven't seen this situation recently (maybe it's been since the HRMS upgrade!)
-- Erin