I would recommend you to unmap and then re-map the entities that are in a 1:1 relationship in your database. You don't have to re-map your complete model, but entities containing a 1:1 relationships. There is no automatic way that would upgrade your .rlinq with the new properties (references from both sides instead of a reference and a collection), so you should manually re-map the entities involved to get the desired result.
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