diff --git a/TIAM.Database.Test/UserDalTests.cs b/TIAM.Database.Test/UserDalTests.cs
index 39ec144c..b8969acd 100644
--- a/TIAM.Database.Test/UserDalTests.cs
+++ b/TIAM.Database.Test/UserDalTests.cs
@@ -5,6 +5,9 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.VisualStudio.TestPlatform.ObjectModel;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
+using Newtonsoft.Json;
+using System.Text.Json.Serialization;
+using System.Text.Json;
 using TIAM.Database.DataLayers.Users;
 using TIAM.Database.DbContexts.Users;
 using TIAM.Entities.Users;
@@ -46,7 +49,26 @@ namespace TIAM.Database.Test
         public override Task GetUserByEmailAsync_ReturnsUser_WhenUserExists(string email)
             => base.GetUserByEmailAsync_ReturnsUser_WhenUserExists(email);
 
+        [TestMethod]
+        [DataRow("540271F6-C604-4C16-8160-D5A7CAFEDF00")]
+        public void SerializeUser_ReturnDeserializedUser_WhenUserAndRelationsExists(string userIdString)
+        {
+            var userId = Guid.Parse(userIdString);
+            var user = Dal.GetUserById(userId);
 
+            JsonSerializerSettings options = new()
+            {
+                ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
+                //NullValueHandling = NullValueHandling.Ignore
+            };
+
+            var serializedUser = JsonConvert.SerializeObject(user, options);
+            user = JsonConvert.DeserializeObject<User>(serializedUser);
+
+            Assert.IsNotNull(user);
+            Assert.IsNotNull(user.UserProductMappings);
+            //Assert.IsNotNull(user.UserProductMappings.FirstOrDefault()?.Product);
+        }
 
         //[TestMethod]
         //[DataRow("test@tiam.hu")]
diff --git a/TIAM.Database/DbContexts/DbContextBase.cs b/TIAM.Database/DbContexts/DbContextBase.cs
index bbecead5..b884bc06 100644
--- a/TIAM.Database/DbContexts/DbContextBase.cs
+++ b/TIAM.Database/DbContexts/DbContextBase.cs
@@ -29,6 +29,7 @@ namespace TIAM.Database.DbContexts
         {
             base.OnConfiguring(optionsBuilder);
 
+            optionsBuilder.UseLazyLoadingProxies(false);
             optionsBuilder.EnableDetailedErrors(true);
 
             //optionsBuilder.UseSqlServer(Configuration.GetConnectionString("DeveloperDbConnection"));
diff --git a/TIAM.Database/DbContexts/Users/UserDbContext.cs b/TIAM.Database/DbContexts/Users/UserDbContext.cs
index b7560bd4..b0dba871 100644
--- a/TIAM.Database/DbContexts/Users/UserDbContext.cs
+++ b/TIAM.Database/DbContexts/Users/UserDbContext.cs
@@ -51,6 +51,7 @@ namespace TIAM.Database.DbContexts.Users
             base.OnModelCreating(modelBuilder);
 
             new UserEntityTypeDefaultConfiguration().Configure(modelBuilder.Entity<User>());
+            new UserProductMappingEntityTypeDefaultConfiguration().Configure(modelBuilder.Entity<UserProductMapping>());
         }
     }
 }
diff --git a/TIAM.Entities/Users/User.cs b/TIAM.Entities/Users/User.cs
index bb22b638..cee29d06 100644
--- a/TIAM.Entities/Users/User.cs
+++ b/TIAM.Entities/Users/User.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -13,7 +14,7 @@ namespace TIAM.Entities.Users
         //public virtual List<Product> Products { get; } = new();
 
         //public virtual ServiceProvider ServiceProvider { get; set; } = new();
-        public virtual List<UserProductMapping> UserProductMappings { get; } = new();
+        public virtual List<UserProductMapping> UserProductMappings { get; set; } = new();
 
         public User() { }
         public User(string email, string password) : this(Guid.NewGuid(), email, password) { }