if all you need to do is satisfy the error, you can use a Get/Load to
get a proxy of the entity if you know the ID.

yourEntity.PreviouslyNullProperty =
session.Load<YourEntityType>(yourEntity.PreviouslyNullPropertyID);
session.Delete(yourEntity);

as long as you don't access any properties of the
PreviouslyNullProperty, NH won't initiate a SELECT to the database.

see 
http://ayende.com/blog/3988/nhibernate-the-difference-between-get-load-and-querying-by-id

On Jul 8, 2:36 am, Evgeniy The Best <[email protected]> wrote:
> It's my question 
> fromhttp://stackoverflow.com/questions/6620554/nhibernate-exception-while...
>
> When I delete object graph and there are some one-way master (many-to-
> one) associations, NH throw error when found this not-null association
> in DB, but didn't find master object in the session.
>
> How to make it work?
> mappings and scheme on stackoverflow

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