When I was using Entity framework code first, I encountered an error when I tried to create an entity into database. The entity is: [ Table (" EmployeeProfile ")] public partial class EmployeeProfile { [ Key ] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int EmployeeProfileID { get; set; } [ ForeignKey ("Employee")] public int EmployeeID { get; set; } public virtual Employee Employee { get; set; } [ ForeignKey (" Profile ")] public int ProfileID { get; set; } public virtual Profile Profile { get; set; } [ Required ] [ StringLength (255)] public string ProfileValue { get; set; } } When creating the entity, some entities have the ProfileValue="", this causes the EntityValidationException with the detailed message " OriginalValues cannot be used for entities in the Added state ". I want to allow the Prof