diff --git a/EGkGeoObjSave.h b/EGkGeoObjSave.h
index 254f8e2..d4db33a 100644
--- a/EGkGeoObjSave.h
+++ b/EGkGeoObjSave.h
@@ -24,8 +24,10 @@ SaveGeoObj( IGeoObj* pGObj, const std::string& sFile, int nFlag = GDB_SV_BIN)
    PtrOwner<IGeomDB> pGeomDB( CreateGeomDB()) ;
    if ( IsNull( pGeomDB))
       return false ;
-  // inserisco l'oggetto nel GeomDB
-   int nId = pGeomDB->AddGeoObj( GDB_ID_NULL, GDB_ID_ROOT, pGObj) ;
+  // inserisco l'oggetto nel GeomDB (sotto pezzo/layer)
+   int nPartId = pGeomDB->AddGroup( GDB_ID_NULL, GDB_ID_ROOT, Frame3d()) ;
+   int nLayId = pGeomDB->AddGroup( GDB_ID_NULL, nPartId, Frame3d()) ;
+   int nId = pGeomDB->AddGeoObj( GDB_ID_NULL, nLayId, pGObj) ;
    if ( nId == GDB_ID_NULL)
       return false ;
   // eseguo il salvataggio