Struggling with the entity framework.....

Has anyone managed to get anything that is not completely trivial to work?

I've done an msdn walkthrough with courses and departments...seemed to
work, and implemented a very simlpe inheritance of course.

Problem now is that if I try to create something myself with is one step
up from completely trivial, I get things like...

"Problem in Mapping Fragment starting at line 249: Potential runtime
violation of table" ...bla bla bla

Is it me? or is this a beta in release clothing?

My slightly non trivial case is just...(in class terms)...

class Expression
{
}

class ListExpression : Expression
{
}

class ListExpressionElement
{
    public Expression expression;
    public ListExpression isMemberOfList;
}

i.e. a pretty simple recursive composite pattern.

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