Is this inheritance auto-mapping at all Possible?

Hi

I've done a bit of research and am still flapping about trying to find my end goal. Just wondering if someone can give me a one syllable answer to this:

I'm using auto-mapping. I have a number of abstract base classes:

public abstract class DomainObject
public abstract class AuditedDomainObject : DomainObject
public abstract class Organisation : AuditedDomainObject
public class Hospital : Organisation

Until recently this has worked just as I've needed. By adding

.IncludeBase()

To my automapper, everything works just as expected by convention. I get two one-one tables: Organisation and Hospital. This is needed as I have a level of abstraction where i need child relationships of Organisation.

I now want to specialise on Organisation and add another level of abstraction between Organisation and Hospital and Trust:

public abstract class Organisation : AuditedDomainObject
public abstract class ParentOrganisation : Organisation
public class ChildOrganisation : Organisation
public class Trust : ParentOrganisation
public class Hospital : ChildOrganisation

This is mapped directly to our domain: it is entirely possible to create a ChildOrganisation which isn't specialised or one that is: A Hospital. ParentOrganisations are always specialised hence it being abstract.

I wish to end up with these tables:
- Organisation - ChildOrganisation - Hospital - Trust

At the moment I get an error on schema generation: System.InvalidOperationException: Tried to add property 'Name' when already added.

'Name' is a property of Organisation - so it looks as if there's some knicker twisting going on, or more likely, i can't see the wood for the trees. Adding

.IgnoreBase< ParentOrganisation >()

had the same effect.

Thanks for any advice