diff --git a/MDM/Models/Recipe/Dto/PfRefProductRecipeDto.cs b/MDM/Models/Recipe/Dto/PfRefProductRecipeDto.cs
index 2acc0ea..29cb833 100644
--- a/MDM/Models/Recipe/Dto/PfRefProductRecipeDto.cs
+++ b/MDM/Models/Recipe/Dto/PfRefProductRecipeDto.cs
@@ -8,16 +8,16 @@ namespace RIZO.Model.MES.recipe.Dto
     /// </summary>
     public class PfRefProductRecipeQueryDto : PagerInfo 
     {
-        public string RecipeCode { get; set; }
+        public string? RecipeCode { get; set; }
 
-        public string Productcode { get; set; }
+        public string? Productcode { get; set; }
 
-        public string ProductName { get; set; }
-        public string FkRoutingCode { get; set; }
+        public string? ProductName { get; set; }
+        public string? FkRoutingCode { get; set; }
 
-        public string FkOperationCode { get; set; }
+        public string? FkOperationCode { get; set; }
 
-        public string FkLineCode { get; set; }
+        public string? FkLineCode { get; set; }
     }
 
     /// <summary>