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Back/Data/Models/OrderItem.cs

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+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace  Back.Data.Models
+{
+    public class OrderItem
+    {
+        public int ID { get; set; }
+        public int OrderID { get; set; }
+        public int PermissionID { get; set; }
+        public int CalculationTypeID { get; set; }
+        public int CreditAmount { get; set; }
+        public decimal APrice { get; set; }
+        public decimal Discount { get; set; }
+        public decimal Tax { get; set; }
+        public decimal Total { get { return (CreditAmount * APrice) - Discount + Tax; } }
+
+        #region Navigation
+        [ForeignKey("OrderID")]
+        public virtual Order Order { get; set; }
+        [ForeignKey("PermissionID")]
+        public virtual Permission Permission { get; set; }
+        [ForeignKey("CalculationTypeID")]
+        public virtual CalculationType CalculationType { get; set; }
+        #endregion
+    }
+}