diff --git a/CompanyManagment.EFCore/Repository/PersonnelCodeRepository.cs b/CompanyManagment.EFCore/Repository/PersonnelCodeRepository.cs
index 48adbbe5..57e27cdc 100644
--- a/CompanyManagment.EFCore/Repository/PersonnelCodeRepository.cs
+++ b/CompanyManagment.EFCore/Repository/PersonnelCodeRepository.cs
@@ -94,7 +94,14 @@ public class PersonnelCodeRepository : RepositoryBase<long, PersonnelCodeDomain>
     #region Mahan
     public long GetLastPersonnelCodeByWorkshop(long workshopId)
     {
-        return _context.PersonnelCodeSet.Where(x => x.WorkshopId == workshopId).Max(x => x.PersonnelCode);
+        var codes = _context.PersonnelCodeSet.Where(x => x.WorkshopId == workshopId);
+
+        if (!codes.Any())
+        {
+            return 0;  // مقدار پیش‌فرض یا هندل خاص تو این حالت
+        }
+
+        return codes.Max(x => x.PersonnelCode);
     }
 
     #endregion
diff --git a/ServiceHost/Areas/Client/Pages/Company/SalaryAid/Index.cshtml.cs b/ServiceHost/Areas/Client/Pages/Company/SalaryAid/Index.cshtml.cs
index 52c064d4..3f32b709 100644
--- a/ServiceHost/Areas/Client/Pages/Company/SalaryAid/Index.cshtml.cs
+++ b/ServiceHost/Areas/Client/Pages/Company/SalaryAid/Index.cshtml.cs
@@ -251,7 +251,7 @@ namespace ServiceHost.Areas.Client.Pages.Company.SalaryAid
 				data = result
 			});
 		}
-        public IActionResult OnGetCheckoutExists(string calculationDate, string employeeIds)
+        public IActionResult OnPostCheckoutExists(string calculationDate, string employeeIds)
         {
 	        var extractNumbers = employeeIds.ExtractNumbers();
 	        var calculationDateGr = calculationDate.ToGeorgianDateTime();
diff --git a/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalCreateNewSalaryAid.js b/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalCreateNewSalaryAid.js
index e65888e9..f8cb1055 100644
--- a/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalCreateNewSalaryAid.js
+++ b/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalCreateNewSalaryAid.js
@@ -333,7 +333,7 @@ function CheckExistAjax() {
     $.ajax({
         async: false,
         dataType: 'json',
-        type: 'GET',
+        type: 'POST',
         url: checkoutExistsAjaxUrl,
         headers: { "RequestVerificationToken": antiForgeryToken },
         traditional: true,
diff --git a/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalEditSalaryAid.js b/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalEditSalaryAid.js
index be9900b8..0832fb43 100644
--- a/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalEditSalaryAid.js
+++ b/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalEditSalaryAid.js
@@ -263,7 +263,7 @@ function CheckExistAjax() {
     $.ajax({
         async: false,
         dataType: 'json',
-        type: 'GET',
+        type: 'POST',
         url: checkoutExistsAjaxUrl,
         headers: { "RequestVerificationToken": antiForgeryToken },
         traditional: true,
diff --git a/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalImportExcel.js b/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalImportExcel.js
index e304bc92..1afcba7f 100644
--- a/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalImportExcel.js
+++ b/ServiceHost/wwwroot/AssetsClient/pages/SalaryAid/js/ModalImportExcel.js
@@ -753,7 +753,7 @@ function CheckExistAjax() {
     $.ajax({
         async: false,
         dataType: 'json',
-        type: 'GET',
+        type: 'POST',
         url: checkoutExistsAjaxUrl,
         headers: { "RequestVerificationToken": antiForgeryToken },
         traditional: true,