Are you getting the “Unable to update the EntitySet ‘xxxx’ because it has a DefiningQuery and no <InsertFunction>”
Check to make sure your table has a primary key – I think the reason that you get this error is that because your table does not have a primary key, EF looks at your table like a view that is not directly updatable and needs special logic (either through .Net code or a stored procedure) to update the table.
Set the primary key, delete the EF model and then re-add it (just refreshing the model didnt do it for me). And you should be back in business.
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