Parent message doesn't exist

Thanks. Looking at the email_order table they look like they are in the correct order:

msg_id rowid
9205270657.AB03850@ben.dciem.dnd.ca 874
9206031720.AA22567@ben.dciem.dnd.ca 875

Could there be something else that is failing to import these parent message?

When I did the first import it looked like there was no grouping at all. I think the problem being that the replies are to the mailing list rather than the originator. Also, some messages don’t have those fields at all, as the archive was put together manually over 28 years in rather haphazard with different versions of Eudora.