Custom validation

Dear friends ,
exploring the ValidationErrorMessageProcessor I noticed that only inform the user about the error field and not the
named entity in ValidationErrorsView and I decided to include this information but I found two things,

1. when we add our own custom validations not updated the {Verifier.ApplicableType}
    which keeps the information of the entity

2. Since fields they have RequiredAttribute why require extra custom validation?

    namespace DomainModel {
        [DataContract(IsReference = true)]
        public class Address : AuditEntityBase, IHasRoot    {
             internal Address()        {   }
             ...
             /// <summary>Gets or sets the StateId. </summary>
             [DataMember]
             [Required]
             public Guid StateId { get; set; }
 
              /// <summary>Gets or sets the State. </summary>
              [DataMember]
              [Required]
              public State State { get; set; }
              ...
              public override void Validate(VerifierResultCollection validationErrors)   {
                     if (State.EntityFacts.EntityAspect.IsNullOrPendingEntity)
                          validationErrors.Add(new VerifierResult(VerifierResultCode.Error, "The State field is required", "State"));
              }
     }

best regards

When we add a new StaffingResource and after save without fill appropriate Address fields then raise an exception
if we put a breakpoint in ValidationErrorHandler the validationErrors return a VerifierResult collection
So we see that custom Verifier type is null

                            [DataContract]
                            [DebuggerDisplay("{ResultCode}; {Message}; {Verifier.ApplicableType}")]
                            public class VerifierResult   {

validationErrors = { [0] ...
                                [1] = Error; "The Address1 field is required."; {DomainModel.Address}
                                ...
                                [5] = Error; "The State field is required"; null
                                ...
                               }

namespace Common.Validation{
    public class ValidationErrorHandler : IValidationErrorNotification    {
        public void OnValidationError(VerifierResultCollection validationErrors)        {
            if (validationErrors.HasErrors)
                EventFns.Publish(new ValidationErrorMessage(validationErrors));
        }
    }
}

Unfortunatley, the VerifierResult class doesn't have a constructor that takes the TargetInstance or a public setter for the TargetInstance property. The setter is internal, so there's currently no way to specify the entity. I suggest you post a feature request to the Data Verification forum.