Created Unassigned: Validation failed for one or more entities. [1571]

So I have the following Entities :

[Table("UserTbl")]
public abstract class User
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int UserId { get; set; }
[Required]
public string Username { get; set; }
[Required]
public DateTime CreatedDate { get; set; }
[Required]
public virtual UserPassword Password { get; set; }
[Required]
public string RegistrationNr { get; set; }
[Required]
public string ContactPerson { get; set; }
[Required]
public string Email { get; set; }
[Required]
public string PhoneNr { get; set; }

[Required]
public bool HasBeenApproved { get; set; }

public DateTime? InactivationDate { get; set; }
}


[Table("UserPasswordTbl")]
public class UserPassword
{
[Required]
[Key]
[ForeignKey("User")]
public int UserId { get; set; }
[Required]
public User User { get; set; }
[Required]
public string Password { get; set; }
[Required]
public string Salt { get; set; }
public DateTime? PasswordChangedDate { get; set; }
public DateTime? LastPasswordFailureDate { get; set; }
public int PasswordFailuresSinceLastSuccess { get; set; }
}


Just a User object which has a property of a password object which is required for it to work.

then when the following method is called:

public string ActivateUser(string encryptedUsername)
{
string decryptedUsername = CryptographyTools.DecryptText(encryptedUsername);
User user = _userRepository.GetUser(decryptedUsername);
if (user != null)
{
user.HasBeenApproved = true;
_userRepository.SaveChanges();
}
return decryptedUsername;
}

a DbEntityValidationException is thrown. The EntityValidationErrors property of the exception suggests that the users Password property is not valid. However(!!), if I put a breakpoint somewhere after retrieving the user object from the repository and before the call to SaveChanges, this exception is not thrown and the entity is successfully updated in the database.

I had to fix this bug by removing the Required attribute from the Password property of the user entity.

I think EF is failing to load my object properly before a call is made to SaveChanges, maybe there is some weird yield return implementation.

//Siavash