diff --git a/IRaCIS.Core.Application/Service/Allocation/_MapConfig.cs b/IRaCIS.Core.Application/Service/Allocation/_MapConfig.cs
index ab95ab4f3..95bebe677 100644
--- a/IRaCIS.Core.Application/Service/Allocation/_MapConfig.cs
+++ b/IRaCIS.Core.Application/Service/Allocation/_MapConfig.cs
@@ -67,7 +67,7 @@ namespace IRaCIS.Core.Application.Service
 
             CreateMap<TaskAllocationRule, TaskAllocationRuleDTO>()
             .ForMember(o => o.DoctorUser, t => t.MapFrom(u => u.Enroll.DoctorUser))
-            .ForMember(o => o.ReadingCategoryList, t => t.MapFrom(u => u.Enroll.EnrollReadingCategoryList.Select(t=>t.ReadingCategory).OrderBy(t=>t).ToList()));
+            .ForMember(o => o.ReadingCategoryList, t => t.MapFrom(u => u.Enroll.EnrollReadingCategoryList.OrderBy(t => t.ReadingCategory).Select(t=>t.ReadingCategory).ToList()));
 
             CreateMap<TaskAllocationRule, AssignDoctorStatView>().IncludeBase<TaskAllocationRule, TaskAllocationRuleDTO>()
                  .ForMember(o => o.AssignedSubjectCount, t => t.MapFrom(u => u.Enroll.DoctorTrialVisitTaskList.Select(t=>t.SubjectId).Distinct().Count()))