diff --git a/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs b/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs
index b66405778..fd935ace9 100644
--- a/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs
+++ b/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs
@@ -5,6 +5,7 @@
 //--------------------------------------------------------------------
 using DocumentFormat.OpenXml.Office2013.Excel;
 using DocumentFormat.OpenXml.Spreadsheet;
+using DocumentFormat.OpenXml.Vml;
 using IRaCIS.Application.Contracts;
 using IRaCIS.Core.Application.Auth;
 using IRaCIS.Core.Application.Helper;
@@ -714,6 +715,11 @@ namespace IRaCIS.Core.Application.Contracts
                 copy.Id = Guid.Empty;
                 copy.CreateTime = DateTime.Now;
 
+                copy.PreliminaryUserId = null;
+                copy.ReviewerUserId = null;
+                copy.PreliminaryTime = null;
+                copy.ReviewerTime = null;
+
                 if (userInfo.ReplaceUserEmailOrPhone != userInfo.EmailOrPhone)
                 {
                     copy.UserName = String.Empty;