diff --git a/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs b/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs
index e3d8a4c9..514d12c8 100644
--- a/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs
+++ b/Company.Domain/InstitutionContractAmendmentTempAgg/InstitutionContractAmendmentTemp.cs
@@ -17,7 +17,7 @@ public class InstitutionContractAmendmentTemp
         NewWorkshops = prevWorkshops.Select(x=> new InstitutionContractAmendmentTempNewWorkshop(
             x.WorkshopName, x.CountPerson, x.ContractAndCheckout, x.ContractAndCheckoutInPerson, x.Insurance,
             x.InsuranceInPerson, x.RollCall, x.RollCallInPerson, x.CustomizeCheckout, x.Price, x.WorkshopId,
-            x.CurrentWorkshopId, 0)).ToList();
+            x.CurrentWorkshopId, 0,x.Id)).ToList();
         InstitutionContractId = institutionContractId;
     }
 
@@ -47,10 +47,11 @@ public class InstitutionContractAmendmentTempNewWorkshop : InstitutionContractAm
 {
     public InstitutionContractAmendmentTempNewWorkshop(string workshopName, int countPerson, bool contractAndCheckout,
         bool contractAndCheckoutInPerson, bool insurance, bool insuranceInPerson, bool rollCall, bool rollCallInPerson,
-        bool customizeCheckout, double price, long workshopId, long currentWorkshopId,double priceDifference) : base(
+        bool customizeCheckout, double price, long workshopId, long currentWorkshopId,double priceDifference,Guid prevId) : base(
         workshopName, countPerson, contractAndCheckout, contractAndCheckoutInPerson, insurance, insuranceInPerson,
         rollCall, rollCallInPerson, customizeCheckout, price, workshopId, currentWorkshopId)
     {
+        Id = prevId;
         PriceDifference = priceDifference;
     }
 
diff --git a/CompanyManagment.EFCore/Repository/InstitutionContractRepository.cs b/CompanyManagment.EFCore/Repository/InstitutionContractRepository.cs
index 25410f22..faa9c3a1 100644
--- a/CompanyManagment.EFCore/Repository/InstitutionContractRepository.cs
+++ b/CompanyManagment.EFCore/Repository/InstitutionContractRepository.cs
@@ -2562,7 +2562,7 @@ public class InstitutionContractRepository : RepositoryBase<long, InstitutionCon
                 request.Insurance, request.InsuranceInPerson,
                 request.RollCall, request.RollCallInPerson,
                 request.CustomizeCheckout, price,
-                request.WorkshopId,0,price);
+                request.WorkshopId,0,price,Guid.NewGuid());
 
             workshopTemp = newWorkshopTemp;
             
@@ -2577,6 +2577,10 @@ public class InstitutionContractRepository : RepositoryBase<long, InstitutionCon
             amendmentTemp.NewWorkshops.Remove(workshopTemp);
         
             var differencePrice = price - workshopTemp.Price;
+            if (differencePrice<0)
+            {
+                differencePrice = 0;
+            }
             workshopTemp.Edit(request.WorkshopName, request.CountPerson,
                 request.ContractAndCheckout, request.ContractAndCheckoutInPerson,
                 request.Insurance, request.InsuranceInPerson,