diff --git a/pvDataApp/factory/Convert.cpp b/pvDataApp/factory/Convert.cpp
index 1441a8f..a17d4eb 100644
--- a/pvDataApp/factory/Convert.cpp
+++ b/pvDataApp/factory/Convert.cpp
@@ -471,7 +471,7 @@ void Convert::copyUnion(PVUnionPtr const & from, PVUnionPtr const & to)
         if (fromValue.get() == 0)
             to->select(PVUnion::UNDEFINED_INDEX);
         else
-            copy(fromValue, to->select(from->getSelectedIndex()));
+            to->set(from->getSelectedFieldName(),from->get());
     }
 }
 
diff --git a/pvDataApp/factory/PVUnion.cpp b/pvDataApp/factory/PVUnion.cpp
index 2eaa8c5..2c9cadf 100644
--- a/pvDataApp/factory/PVUnion.cpp
+++ b/pvDataApp/factory/PVUnion.cpp
@@ -126,6 +126,7 @@ void PVUnion::set(int32 index, PVFieldPtr const & value)
 
     selector = index;
     this->value = value;
+    postPut();
 }
 
 void PVUnion::set(String const & fieldName, PVFieldPtr const & value)