diff --git a/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs b/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs
index b6c05d2bb..e8f7478cc 100644
--- a/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs
@@ -2271,7 +2271,7 @@ public class VisitTaskService(IRepository<VisitTask> _visitTaskRepository,
 
                 foreach (var instance in studyInstanceList)
                 {
-                    var newInstanceId = IdentifierHelper.CreateGuid(newStudy.StudyInstanceUid, newSeries.SeriesInstanceUid, instance.SopInstanceUid, newStudy.TrialId.ToString(), newStudy.ToString());
+                    var newInstanceId = IdentifierHelper.CreateGuid(newStudy.StudyInstanceUid, newSeries.SeriesInstanceUid, instance.SopInstanceUid, newStudy.TrialId.ToString(), newTaskId.ToString());
 
                     var newInstance = instance.Clone();