I use EF for several years and I'm testing Open Access.
I Have the following model :
BusinessRecord (base class for Invoice)
Invoice (Sub class)
Invoice have the Address navigation property and IdentifierAddress property inherit from BusinessRecord.
When I Set the IdentifierAddress, no problem.
When I Set the Address, I get the following exception :
No row for BusinessManager2012.DAL.Address ('Address') GenericOID@5d464c86 Address Identifier=0
The problem hapen only when adding Invoice, not when editing a loaded one.