[Area] Inheritance Suppose a base class had a method that inputs a parameter of the Common table, which is the base of all tables. In a derived class it was possible to override the method to instead input MyTable. Now the parameter signatures of the base method and its override method must match exactly. Also, the return types must match exactly. For more information, see Overriding a Method. [Syntax rule] 
Override of a base method must have the exact same return type and parameter signature as the base method