Data Model problems

messedup.cs

using System;
using System.ComponentModel;

namespace ProblemChild.Models
{
    public class FinancialProductBase
    {
        public int Id { get; set; }
        public DateTime Timestamp { get; set; }
        public string TraderName { get; set; }
        
    }

    public class SpecialFinancialProduct1:FinancialProductBase
    {
        public int Quantity1 { get; set; }
        public int Quantity2 { get; set; }
    }

    public class DifferentSpecialFinancialProduct:SpecialFinancialProduct1
    {
        [DisplayName("New Quantity")]
        public new int Quantity1 { get; set; }

        [DisplayName("Old Quantity")]
        public new int Quantity2 { get; set; }
    }

    public class NotSpecialFinancialProduct:FinancialProductBase
    {
        [DisplayName("Entry Time")]
        public new DateTime Timestamp { get; set; }

        public string Comment { get; set; }
    }
}