Relationship delete rules

Hello,

I have an object A that has a one-to-one relationship to object B.   
The delete rule for this relationship is nullify.  Object A has a  
field (foreign key) that is the primary key of Object B.  Object B  
has a one-to-one relationship with Object A.  The delete rule for  
that relationship is cascade.

I have a piece of code that looks like this:

             ec.lock();

             for(int i = 0; i < objects.count(); i++){
                 A a = (A)objects.objectAtIndex(i);

                 if(a.b() != null){
                     ec.deleteObject(a.b());
                 }
             }

             ec.saveChanges();
             ec.unlock();

This code runs without throwing any exceptions.  I believe that once  
this code has ran the field in Object A that is is the foreign key  
(i.e. the primary key of Object B) should be null.  Am I correct in  
thinking this?  For some reason after the code has ran the foreign  
key in Object A is not null.  Is my interpretation of how the delete  
rule works incorrect?  What else might I be doing wrong?

Regards,
Jeff

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