Well...this one totally died on the FSA list.

FM8.5 OS X 10.4 Server 8.04
I looked in the archives and came up empty.
A large solution, converted from 6 to 8, about 6 months ago. We have a
PO db and a PO_Details db - standard pre-7 structure.
Logged in as dev user - I tried to delete a PO and got this message
"This operation cannot be performed because one or more required
related tables are missing."
There are no missing file refs, there are no missing tables on the
graph - the relationship between parent and child is a "create records,
delete from child when parent is deleted".

Ideas?