I added a new ADO.Net Entity Data Model into my project and used the Update Wizard to add tables into the model. Five of the selected tables were added to the design surfac
Check for 'Nulls' in your particular table. If all the columns are set to 'Allow Null' Entity Framework considers it as a 'Null' table. I had the same problem and unchecked 'Allow Null' and it added the required table.