I have an optional many-2-many relationship between entities A and B. 
EntityModeler creates a join table with nothing modelled but the logical m:n 
relationships.

Now I need a qualifier to fetch all As that are either assigned to a given B or 
not assigned at all.

Following part works (finding all As assigned to a given B):

A.TO_MANY_B_ERXKEY.eq(myBObject)

Trying to find all As that have NO relationship to any B either finds nothing

A.TO_MANY_B_ERXKEY.isNull()

or results in a NullPointerException

A.TO_MANY_B_ERXKEY.isEmptyRelationship()

What am I missing here? In the end I want to simply join the two partial 
qualifiers by .or()

Thanks
---markus---

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