model inheritance, abtract=True

Dear all,

I have the following error, and don't know what it means:

Error: One or more models did not validate:
update.personupdate: 'address' has a relation with model Address,
which has either not been installed or is abstract.

I did a pretty big refactoring, but I think the problems started when
I separated my Person class into an abstract base class PersonProfile
and a derived class Person, and added the class PersonUpdate, deriving
from PersonProfile too.

Can anybody help?

Thanks in advance, cheers,

Roald

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