entity-framework-designer

I'm in a situation where I have a table called Elements . Now I'm creating a table called Divergences that will store basically pairs of Elements . The purpose of Divergence is to check if two Elements have diverging answers. Element Divergence --------- ---------- ElementId ElementId1 ElementId2 In the above table schema, ElementId1 and ElementId2 are Foreign Keys mapping to ElementId in Elements table and form the composite primary key for the Divergence table. I use Database First approach where I create the tables in SQL Server Management Studio and later I do a Update Model from Database.