diff --git a/ZCppMain/ZMainHead.H b/ZCppMain/ZMainHead.H
index 8054009..b74dd52 100644
--- a/ZCppMain/ZMainHead.H
+++ b/ZCppMain/ZMainHead.H
@@ -3735,7 +3735,10 @@ namespace ZNsMain
     /************************************************************/
 
         template<typename TTypeChainNext> typename
-            TTypeChainNext::TypeData& GetData()
+            TTypeChainNext::TypeData & GetData()
+        { return this->TTypeChainNext::GetData(); }
+        template<typename TTypeChainNext> typename
+            TTypeChainNext::TypeDataC& GetData() const
         { return this->TTypeChainNext::GetData(); }
 
         /*  AO_CView.OnMeetData() 은 다음 TypeChainNext 을 호출할
@@ -3857,11 +3860,10 @@ namespace ZNsMain
         TypeChainNextC& operator()  () const{ return (*this); }
     /************************************************************/
 
-        template<typename TTypeChainNext> TypeData& GetData()
-        {
-            return this->GetData();
-        }/*
-        template<typename TTypeChainNext> TypeData& GetData()*/
+        template<typename TTypeChainNext> TypeData & GetData()
+            { return this->GetData(); }
+        template<typename TTypeChainNext> TypeDataC& GetData() const
+            { return this->GetData(); }
 
         template<typename TViewChain> void IterHead(TViewChain AO_CView)
         {