diff --git a/EXE_GdbPartLayers.cpp b/EXE_GdbPartLayers.cpp
index b893715..3c25988 100644
--- a/EXE_GdbPartLayers.cpp
+++ b/EXE_GdbPartLayers.cpp
@@ -690,6 +690,24 @@ ExeDuploNew( int nSouId)
    return nNewId ;
 }
 
+//-----------------------------------------------------------------------------
+static bool
+IsPartForDuplo( IGeomDB* pGeomDB, int nPartId)
+{
+  // è veramente un pezzo
+   if ( ExeIsPart( nPartId))
+      return true ;
+  // è un pezzo spostato altrove
+   int nBaseId, nLev ;
+   if ( pGeomDB->GetInfo( nPartId, GDB_SI_BASE, nBaseId)  &&
+        pGeomDB->GetGdbType( nPartId) == GDB_TY_GROUP  &&
+        pGeomDB->GetParentId( nBaseId) == GDB_ID_ROOT  &&
+        pGeomDB->GetLevel( nPartId, nLev)  &&  nLev == GDB_LV_USER)
+      return true ;
+  // altrimenti non è un pezzo
+   return false ;
+}
+
 //-----------------------------------------------------------------------------
 bool
 ExeDuploCount( int nSouId, int& nCount)
@@ -697,7 +715,7 @@ ExeDuploCount( int nSouId, int& nCount)
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, false)
   // Verifico sia un pezzo
-   if ( ! ExeIsPart( nSouId))
+   if ( ! IsPartForDuplo( pGeomDB, nSouId))
       return false ;
   // Recupero info del sorgente
    INTVECTOR vnRef ;