diff --git a/MDM/Models/Material/Dto/MaterialBomDto.cs b/MDM/Models/Material/Dto/MaterialBomDto.cs
index 4f45dbb..039cf3a 100644
--- a/MDM/Models/Material/Dto/MaterialBomDto.cs
+++ b/MDM/Models/Material/Dto/MaterialBomDto.cs
@@ -8,8 +8,8 @@ namespace MDM.Model.Material.Dto
     /// </summary>
     public class MaterialBomQueryDto : PagerInfo 
     {
-        public string InvCode { get; set; }
-        public string SubInvCode { get; set; }
+        public string? InvCode { get; set; }
+        public string? SubInvCode { get; set; }
     }
 
     /// <summary>
diff --git a/MDM/Models/Material/Dto/MaterialTypeDto.cs b/MDM/Models/Material/Dto/MaterialTypeDto.cs
index ee39ded..d165459 100644
--- a/MDM/Models/Material/Dto/MaterialTypeDto.cs
+++ b/MDM/Models/Material/Dto/MaterialTypeDto.cs
@@ -7,11 +7,11 @@ namespace MDM.Model.Material.Dto
     /// </summary>
     public class MaterialTypeQueryDto : PagerInfo 
     {
-        public string Name { get; set; }
+        public string? Name { get; set; }
 
-        public string Code { get; set; }
+        public string? Code { get; set; }
 
-        public string ParentCode { get; set; }
+        public string? ParentCode { get; set; }
 
         public int? Status { get; set; }
     }
diff --git a/MDM/Models/Plant/Dto/PlantFactorySiteDto.cs b/MDM/Models/Plant/Dto/PlantFactorySiteDto.cs
index add3d34..470c91f 100644
--- a/MDM/Models/Plant/Dto/PlantFactorySiteDto.cs
+++ b/MDM/Models/Plant/Dto/PlantFactorySiteDto.cs
@@ -7,11 +7,11 @@ namespace MDM.Model.Plant.Dto
     /// </summary>
     public class PlantFactorySiteQueryDto : PagerInfo 
     {
-        public string SiteCode { get; set; }
+        public string? SiteCode { get; set; }
 
-        public string SiteName { get; set; }
+        public string? SiteName { get; set; }
 
-        public string SiteType { get; set; }
+        public string? SiteType { get; set; }
         public int? Status { get; set; }
     }
 
diff --git a/MDM/Models/Plant/Dto/PlantProductlinebodyDto.cs b/MDM/Models/Plant/Dto/PlantProductlinebodyDto.cs
index 1b49364..b1b667a 100644
--- a/MDM/Models/Plant/Dto/PlantProductlinebodyDto.cs
+++ b/MDM/Models/Plant/Dto/PlantProductlinebodyDto.cs
@@ -7,14 +7,14 @@ namespace MDM.Model.Plant.Dto
     /// </summary>
     public class PlantProductlinebodyQueryDto : PagerInfo 
     {
-        public string FkFactorySiteCode { get; set; }
+        public string? FkFactorySiteCode { get; set; }
 
-        public string FkWorkshopCode { get; set; }
+        public string? FkWorkshopCode { get; set; }
 
       
-        public string LineCode { get; set; }
+        public string? LineCode { get; set; }
 
-        public string LineName { get; set; }
+        public string? LineName { get; set; }
 
     }
 
diff --git a/MDM/Models/Plant/Dto/PlantWorkshopDto.cs b/MDM/Models/Plant/Dto/PlantWorkshopDto.cs
index 968044b..64ed437 100644
--- a/MDM/Models/Plant/Dto/PlantWorkshopDto.cs
+++ b/MDM/Models/Plant/Dto/PlantWorkshopDto.cs
@@ -7,11 +7,11 @@ namespace MDM.Model.Plant.Dto
     /// </summary>
     public class PlantWorkshopQueryDto : PagerInfo
     {
-        public string FkSiteCode { get; set; }
+        public string? FkSiteCode { get; set; }
 
-        public string WorkshopCode { get; set; }
+        public string? WorkshopCode { get; set; }
 
-        public string WorkshopName { get; set; }
+        public string? WorkshopName { get; set; }
 
         public int? Status { get; set; }
     }
diff --git a/MDM/Models/Plant/Dto/PlantWorkstationDto.cs b/MDM/Models/Plant/Dto/PlantWorkstationDto.cs
index 7639ea4..62fa007 100644
--- a/MDM/Models/Plant/Dto/PlantWorkstationDto.cs
+++ b/MDM/Models/Plant/Dto/PlantWorkstationDto.cs
@@ -7,20 +7,20 @@ namespace MDM.Model.Plant.Dto
     /// </summary>
     public class PlantWorkstationQueryDto : PagerInfo 
     {
-        public string FkFactorySiteCode { get; set; }
+        public string? FkFactorySiteCode { get; set; }
 
-        public string FkWorkshopCode { get; set; }
+        public string? FkWorkshopCode { get; set; }
 
-        public string FkProductlinebody { get; set; }
+        public string? FkProductlinebody { get; set; }
 
     
-        public string WorkstationCode { get; set; }
+        public string? WorkstationCode { get; set; }
 
-        public string WorkstationName { get; set; }
+        public string? WorkstationName { get; set; }
 
-        public string FunctionGroupCode { get; set; }
+        public string? FunctionGroupCode { get; set; }
 
-        public string FunctionGroupName { get; set; }
+        public string? FunctionGroupName { get; set; }
     }
 
     /// <summary>
diff --git a/MDM/Models/Process/Dto/ProcessControlStrategyDictDto.cs b/MDM/Models/Process/Dto/ProcessControlStrategyDictDto.cs
index 44189c8..28f3a1a 100644
--- a/MDM/Models/Process/Dto/ProcessControlStrategyDictDto.cs
+++ b/MDM/Models/Process/Dto/ProcessControlStrategyDictDto.cs
@@ -7,9 +7,9 @@ namespace MDM.Model.Process.Dto
     /// </summary>
     public class ProcessControlStrategyDictQueryDto : PagerInfo 
     {
-        public string StrategyCode { get; set; }
+        public string? StrategyCode { get; set; }
 
-        public string StrategyName { get; set; }
+        public string? StrategyName { get; set; }
     }
 
     /// <summary>
diff --git a/MDM/Models/Process/Dto/ProcessOperationDto.cs b/MDM/Models/Process/Dto/ProcessOperationDto.cs
index 1a493cc..26b10ba 100644
--- a/MDM/Models/Process/Dto/ProcessOperationDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationDto.cs
@@ -7,12 +7,12 @@ namespace MDM.Model.Process.Dto
     /// </summary>
     public class ProcessOperationQueryDto : PagerInfo 
     {
-        public string FkRoutingCode { get; set; }
-        public string OperationCode { get; set; }
+        public string? FkRoutingCode { get; set; }
+        public string? OperationCode { get; set; }
 
-        public string OperationName { get; set; }
+        public string? OperationName { get; set; }
 
-        public string ParallelGroupCode { get; set; }
+        public string? ParallelGroupCode { get; set; }
 
     }
 
diff --git a/MDM/Models/Process/Dto/ProcessOperationReworkRuleDto.cs b/MDM/Models/Process/Dto/ProcessOperationReworkRuleDto.cs
index 22ac8fc..f4eb388 100644
--- a/MDM/Models/Process/Dto/ProcessOperationReworkRuleDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationReworkRuleDto.cs
@@ -7,9 +7,9 @@ namespace MDM.Model.Process.Dto
     /// </summary>
     public class ProcessOperationReworkRuleQueryDto : PagerInfo 
     {
-        public string FkRoutingCode { get; set; }
+        public string? FkRoutingCode { get; set; }
 
-        public string FkOperationCode { get; set; }
+        public string? FkOperationCode { get; set; }
     }
 
     /// <summary>
diff --git a/MDM/Models/Process/Dto/ProcessOperationTransitionDto.cs b/MDM/Models/Process/Dto/ProcessOperationTransitionDto.cs
index 405ffa3..79b90eb 100644
--- a/MDM/Models/Process/Dto/ProcessOperationTransitionDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOperationTransitionDto.cs
@@ -7,11 +7,11 @@ namespace MDM.Model.Process.Dto
     /// </summary>
     public class ProcessOperationTransitionQueryDto : PagerInfo 
     {
-        public string FkRoutingCode { get; set; }
+        public string? FkRoutingCode { get; set; }
 
-        public string FromOperationCode { get; set; }
+        public string? FromOperationCode { get; set; }
 
-        public string ToOperationCode { get; set; }
+        public string? ToOperationCode { get; set; }
     }
 
     /// <summary>
diff --git a/MDM/Models/Process/Dto/ProcessOprerationTransitionDictDto.cs b/MDM/Models/Process/Dto/ProcessOprerationTransitionDictDto.cs
index 2f26e42..7848057 100644
--- a/MDM/Models/Process/Dto/ProcessOprerationTransitionDictDto.cs
+++ b/MDM/Models/Process/Dto/ProcessOprerationTransitionDictDto.cs
@@ -7,9 +7,9 @@ namespace MDM.Model.Process.Dto
     /// </summary>
     public class ProcessOprerationTransitionDictQueryDto : PagerInfo 
     {
-        public string TransitionCode { get; set; }
+        public string? TransitionCode { get; set; }
 
-        public string TranstionName { get; set; }
+        public string? TranstionName { get; set; }
     }
 
     /// <summary>
diff --git a/MDM/Models/Process/Dto/ProcessRoutingDto.cs b/MDM/Models/Process/Dto/ProcessRoutingDto.cs
index 01f8103..71286c5 100644
--- a/MDM/Models/Process/Dto/ProcessRoutingDto.cs
+++ b/MDM/Models/Process/Dto/ProcessRoutingDto.cs
@@ -7,10 +7,10 @@ namespace MDM.Model.Process.Dto
     /// </summary>
     public class ProcessRoutingQueryDto : PagerInfo 
     {
-        public string FkProductMaterialCode { get; set; }
-        public string RoutingCode { get; set; }
+        public string? FkProductMaterialCode { get; set; }
+        public string? RoutingCode { get; set; }
 
-        public string RoutingName { get; set; }
+        public string? RoutingName { get; set; }
 
         public int? Version { get; set; }