diff --git a/Marco.Pms.Services/Service/MasterService.cs b/Marco.Pms.Services/Service/MasterService.cs
index ad191fa..c2f9086 100644
--- a/Marco.Pms.Services/Service/MasterService.cs
+++ b/Marco.Pms.Services/Service/MasterService.cs
@@ -3857,7 +3857,7 @@ namespace Marco.Pms.Services.Service
                     return ApiResponse<object>.ErrorResponse("Product Category Master of same name already exists", "Product Category Master of same name already exists", 409);
                 }
 
-                if (model.Id.HasValue && model.Id == id)
+                if (model.Id.HasValue && model.Id != id)
                 {
                     _logger.LogWarning("User provided invalid information while updating Product Category Master");
                     return ApiResponse<object>.ErrorResponse("Invalid information", "User provided invalid information", 400);