diff --git a/BMA.EHR.Leave/Controllers/LeaveBeginningController.cs b/BMA.EHR.Leave/Controllers/LeaveBeginningController.cs
index 3771aa93..e37ab06a 100644
--- a/BMA.EHR.Leave/Controllers/LeaveBeginningController.cs
+++ b/BMA.EHR.Leave/Controllers/LeaveBeginningController.cs
@@ -11,6 +11,7 @@ using Newtonsoft.Json.Linq;
 using OfficeOpenXml.ConditionalFormatting;
 using Swashbuckle.AspNetCore.Annotations;
 using System.Security.Claims;
+using Microsoft.EntityFrameworkCore;
 
 namespace BMA.EHR.Leave.Service.Controllers
 {
@@ -295,6 +296,16 @@ namespace BMA.EHR.Leave.Service.Controllers
                     return Error("ไม่พบข้อมูลข้าราชการหรือลูกจ้าง", StatusCodes.Status404NotFound);
                 }
 
+                // check duplicate
+                var oldData = await _context.LeaveBeginnings.FirstOrDefaultAsync(x => x.ProfileId == req.ProfileId
+                    && x.LeaveTypeId == req.LeaveTypeId
+                    && x.LeaveYear == req.LeaveYear);
+
+                if (oldData is not null)
+                {
+                    return Error("ไม่สามารถบันทึกข้อมูล เนื่องจากมีข้อมูลในระบบแล้ว");
+                }
+                
                 var leaveBeginning = new LeaveBeginning();
                 leaveBeginning.LeaveTypeId = req.LeaveTypeId;
                 leaveBeginning.LeaveYear = req.LeaveYear;