I have a entity set defined as:

public sealed class Folder<T> : EntityBase, IFolder
    {
        [Field(Length = 255, DefaultValue = "")]
        [NotNullOrEmptyConstraint]
        public string Name { get; set; }

        [Field]
        [Association(PairTo = "Parent")]
        public EntitySet<Folder<T>> Folders { get; set; }

        [Field]
        [Association(OnOwnerRemove = OnRemoveAction.Clear, OnTargetRemove = OnRemoveAction.Deny)]
        public Folder<T> Parent { get; set; }
    }

    [HierarchyRoot(InheritanceSchema = InheritanceSchema.ConcreteTable)]
    [Serializable]
    public abstract class EntityBase : Entity
    {
        [Field, Key]
        public long Id { get; private set; }
    }

When i try to create some instance of this entity and commit transaction, exception is thrown:

System.InvalidOperationException: Can not commit a transaction. Entities validation failed. ---> Xtensive.Core.AggregateException: Validation failed. ---> System.InvalidOperationException: Операции позднего связывания не могут быть выполнены для типов или методов, для которых значение ContainsGenericParameters является true.
   в System.Reflection.RuntimeMethodInfo.ThrowNoInvokeException()
   в System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   в System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   в System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   в Xtensive.Orm.Validation.PropertyConstraintAspect.<GetPropertyValue>b__1(PropertyConstraintAspect _this)
   в Xtensive.Threading.ThreadSafeCached`1.GetValue[T1](Func`2 generator, T1 argument)
   в Xtensive.Orm.Validation.PropertyConstraintAspect.GetPropertyValue(IValidationAware target)
   в Xtensive.Orm.Validation.PropertyConstraintAspect.Check(IValidationAware target)
   в Xtensive.Orm.Validation.ValidationContext.Validate()
   --- Конец трассировки внутреннего стека исключений ---
   в Xtensive.Orm.Validation.ValidationContext.Validate()
   в Xtensive.Orm.Session.Validate()
   в Xtensive.Orm.Transaction.CompleteValidation()
   --- Конец трассировки внутреннего стека исключений ---
   в Xtensive.Orm.Transaction.CompleteValidation()
   в Xtensive.Orm.Transaction.Commit()
   в Xtensive.Orm.TransactionScope.Dispose()

If i remove [NotNullOrEmptyConstraint] constraint on Name field - everything is going fine. It seems, like you have a bug in code and your code is not ready to process validation on entity with generic parameters used in this manner.