diff --git a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_InvigilateTeacher/Exam_InvigilateTeacherService.cs b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_InvigilateTeacher/Exam_InvigilateTeacherService.cs
index 0c92192b2..38c8c5eb1 100644
--- a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_InvigilateTeacher/Exam_InvigilateTeacherService.cs	
+++ b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_InvigilateTeacher/Exam_InvigilateTeacherService.cs	
@@ -236,6 +236,7 @@ namespace Learun.Application.TwoDevelopment.EducationalAdministration
            ,[ITOrder]
            ,[ITEnabled])
 select newid(),'{AcademicYearNo}','{Semester}',empname,empno,0,1 from empinfo where checkmark=1
+ and empno not in (select empno from Exam_InvigilateTeacher where AcademicYearNo='{AcademicYearNo}' and Semester='{Semester}')
 ";
                 return this.BaseRepository("CollegeMIS").ExecuteBySql(sql);
             }