public class TransactionExtension : Entity<TransactionExtension> {

        [Key]
        public int Id { get; set; }

        [StringLength(100)]
        public string FieldName { get; set; }

        [StringLength(25)]
        public string FieldType { get; set; }

        [StringLength(500)]
        public string Value { get; set; }

        public int Ordinal { get; set; }

        [ForeignKey("Transaction")]
        public int? TransactionId { get; set; }

        public Transaction Transaction { get; set; }

        public int? Transaction2Id { get; set; }

        public Transaction2 Transaction2 { get; set; }

        public int? Transaction3Id { get; set; }

        public Transaction3 Transaction3 { get; set; }
    }