Error “not an association id” in nhibernate

Question

I got the following error message from nhibernate:

{"not an association: ID"}

Model.Order orderAlias = null;
Model.Unit unitAlias = null;

query to reproduce:

var query = m_hibernateSession.QueryOver<Model.Order>(() => orderAlias)
                    .JoinAlias(() => orderAlias.ID, () => unitAlias, JoinType.InnerJoin)
                    .TransformUsing(Transformers.DistinctRootEntity)
                    .OrderBy(x => x.PONumber).Desc.Take(5);

(for DB model look also here: nhibernate criteria for selecting from different tables )

What does this mean and how can I correctly retrieve my result list?

Thx

Answer 1

In Model.Order class, ID should be of type Model.Unit.

Make sure you have classes for both Model.Order and Model.Unit