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Back/Data/Models/PermissionUser.cs

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+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace  Back.Data.Models
+{
+    [PrimaryKey("PermissionID", "RolUserID")]
+    public class PermissionUser
+    {
+        public int PermissionID { get; set; }
+        public int RolUserID { get; set; }
+
+        #region Navigation
+        [ForeignKey("RolUserID")]
+        public virtual RolUser RolUser { get; set; }
+        [ForeignKey("PermissionID")]
+        public virtual Permission Permission { get; set; }
+        #endregion
+    }
+}