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I solve this problem, only one table was causing the real problem and that problem was that this table has 2 foreign keys and when you are about to update the model from data base,entity framework 6 ask you if you want to bring the foreign key(but just one), if your table has 2 or more foreign keys EF6 doesnt bring that table to the model and add it to model.store, i just unchecked that bring foreign key option, and thats it the tabla was added successfully to the model.