These errors are generated for a series of relationships. In the example I'm showing here, there's a simple relationship between two tables: Endereco (address) and Usuario (user). A user can have multiple addresses associated to him, hence the association
below. Maybe I'm missing a trivial sql concept here. Hopefully. =)
This is the DBML specific area related to the problem
These are the properties for the relationship
This is the SQL Script generated by T4
This is the error generated in VS2008 (Sql)
Hope this helps figuring it out.
Thanks for the effort, Oleg.