diff --git a/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailDeliveryDataModel.cs b/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailDeliveryDataModel.cs
new file mode 100644
index 0000000..886be81
--- /dev/null
+++ b/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailDeliveryDataModel.cs
@@ -0,0 +1,37 @@
+using ElectricalRepairServiceContract.Exceptions;
+using ElectricalRepairServiceContract.Extensions;
+using ElectricalRepairServiceContract.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ElectricalRepairServiceContract.DataModels
+{
+    public class DetailDeliveryDataModel : IValidation
+    {   
+        public string Id { get; private set; }
+        public string DetailId { get; private set; }
+        public int Amount { get; private set; }
+        public DateTime Date { get; private set; }
+
+        public DetailDeliveryDataModel(string id, string detailId, int amount, DateTime date) 
+        {
+            Id = id;
+            DetailId = detailId;
+            Amount = amount;
+            Date = date;
+        }
+
+        public void Validate()
+        {
+            if (Id.IsEmpty())
+                throw new ValidationException("Field Id is empty");
+            if (!Id.IsGuid())
+                throw new ValidationException("The value in the field Id is not a unique identifier");
+            if (Amount <= 0)
+                throw new ValidationException("The Amount must be more then 0");
+        }
+    }
+}
diff --git a/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailsDataModel.cs b/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailsDataModel.cs
index fc1ffb5..9b7adb0 100644
--- a/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailsDataModel.cs
+++ b/ElectricalRepairService/ElectricalRepairServiceContract/DataModels/DetailsDataModel.cs
@@ -16,16 +16,20 @@ namespace ElectricalRepairServiceContract.DataModels
         public string Name { get; private set; }
         public int Count { get; private set; }
         public int OldCount { get; private set; }
-
         public DateTime UpdateDate { get; private set; }
+        public List<DetailDeliveryDataModel>? DetailsDelivery {  get; private set; }
+        public List<DetailsUseDataModel>? DetailsUses { get; private set; }
 
-        public DetailsDataModel(string id, string name, int count, int oldCount, DateTime updateDate)
+        public DetailsDataModel(string id, string name, int count, int oldCount,
+            DateTime updateDate, List<DetailDeliveryDataModel>? detailsDelivery, List<DetailsUseDataModel>? detailsUses)
         {
             Id = id;
             Name = name;
             Count = count;
             OldCount = oldCount;
             UpdateDate = updateDate;
+            DetailsDelivery = detailsDelivery;
+            DetailsUses = detailsUses;
         }
 
         public void Validate()
@@ -37,9 +41,9 @@ namespace ElectricalRepairServiceContract.DataModels
             if (Name.IsEmpty())
                 throw new ValidationException("Field Description is empty");
             if (Count < 0)
-                throw new ValidationException("The count must be more then 0");
+                throw new ValidationException("The count must be positive");
             if (OldCount < 0)
-                throw new ValidationException("The count must be more then 0");
+                throw new ValidationException("The count must be positive");
         }
     }
 }
diff --git a/ElectricalRepairService/ElectricalRepairServiceTests/DataModelsTests/DetailsDataModelTest.cs b/ElectricalRepairService/ElectricalRepairServiceTests/DataModelsTests/DetailsDataModelTest.cs
index 3df99f5..2588f63 100644
--- a/ElectricalRepairService/ElectricalRepairServiceTests/DataModelsTests/DetailsDataModelTest.cs
+++ b/ElectricalRepairService/ElectricalRepairServiceTests/DataModelsTests/DetailsDataModelTest.cs
@@ -10,41 +10,41 @@ namespace ElectricalRepairServiceTests.DataModelsTests
         [Test]
         public void IdIsNullOrEmptyTest()
         {
-            var details = CreateDataModel(null, "name", 1, 1, DateTime.Now);
+            var details = CreateDataModel(null, "name", 1, 1, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
 
-            details = CreateDataModel(string.Empty, "name", 1, 1, DateTime.Now);
+            details = CreateDataModel(string.Empty, "name", 1, 1, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
         }
 
         [Test]
         public void IdIsNotGuidTest()
         {
-            var details = CreateDataModel("invalid-id", "name", 1, 1, DateTime.Now);
+            var details = CreateDataModel("invalid-id", "name", 1, 1, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
         }
 
         [Test]
         public void NameIsNullOrEmptyTest()
         {
-            var details = CreateDataModel(Guid.NewGuid().ToString(), null, 1, 1, DateTime.Now);
+            var details = CreateDataModel(Guid.NewGuid().ToString(), null, 1, 1, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
 
-            details = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 1, 1, DateTime.Now);
+            details = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 1, 1, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
         }
 
         [Test]
         public void CountIsNegativeTest()
         {
-            var details = CreateDataModel(Guid.NewGuid().ToString(), "name", -1, 10, DateTime.Now);
+            var details = CreateDataModel(Guid.NewGuid().ToString(), "name", -1, 10, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
         }
 
         [Test]
         public void OldCountIsNegativeTest()
         {
-            var details = CreateDataModel(Guid.NewGuid().ToString(), "name", 10, -1, DateTime.Now);
+            var details = CreateDataModel(Guid.NewGuid().ToString(), "name", 10, -1, DateTime.Now, null, null);
             Assert.That(() => details.Validate(), Throws.TypeOf<ValidationException>());
         }
 
@@ -56,17 +56,23 @@ namespace ElectricalRepairServiceTests.DataModelsTests
             var count = 10;
             var oldCount = 10;
             var dateTime = DateTime.Now;
+            List<DetailDeliveryDataModel> detailsDelivery = [new DetailDeliveryDataModel(null, null, 0, DateTime.Now)];
+            List<DetailsUseDataModel> detailsUses = [new DetailsUseDataModel(null, null, 0)];
 
-            var details = CreateDataModel(id, name, count, oldCount, dateTime);
+            var details = CreateDataModel(id, name, count, oldCount, dateTime, detailsDelivery, detailsUses);
 
             Assert.That(details.Id, Is.EqualTo(id));
             Assert.That(details.Name, Is.EqualTo(name));
             Assert.That(details.Count, Is.EqualTo(count));
             Assert.That(details.OldCount, Is.EqualTo(oldCount));
             Assert.That(details.UpdateDate, Is.EqualTo(dateTime));
+            Assert.That(details.DetailsDelivery, Is.EqualTo(detailsDelivery));
+            Assert.That(details.DetailsUses, Is.EqualTo(detailsUses));
         }
 
-        private DetailsDataModel CreateDataModel(string id, string name, int count, int oldCount, DateTime dateTime)
-            => new DetailsDataModel(id, name, count, oldCount, dateTime);
+        private DetailsDataModel CreateDataModel(string id, string name, int count, int oldCount,
+            DateTime dateTime, List<DetailDeliveryDataModel>? detailsDelivery, List<DetailsUseDataModel>? detailsUses)
+            => new DetailsDataModel(id, name, count, oldCount,
+                dateTime, detailsDelivery, detailsUses);
     }
 }