diff --git a/EXE_GdbCreateSurf.cpp b/EXE_GdbCreateSurf.cpp
index 7ab640e..4e8fe44 100644
--- a/EXE_GdbCreateSurf.cpp
+++ b/EXE_GdbCreateSurf.cpp
@@ -2141,7 +2141,7 @@ ExeCreateSurfBzByRegion( int nParentId, const INTVECTOR& vCrvIds, double dLinTol
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
-      nParentId = AdjustId( nParentId) ;
+   nParentId = AdjustId( nParentId) ;
    bool bOk = true ;
    // recupero il riferimento locale
    Frame3d frLoc ;
@@ -2182,11 +2182,11 @@ ExeCreateSurfBzByRegion( int nParentId, const INTVECTOR& vCrvIds, double dLinTol
 //-------------------------------------------------------------------------------
 int
 ExeCreateSurfBzByExtrusion( int nParentId, int nCrvId, const Vector3d& vtExtr, bool bCapEnds,
-                            double dLinTol, int nRefType)
+                            double dLinTol, int nRefType, int* pnCount)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, GDB_ID_NULL)
-      nParentId = AdjustId( nParentId) ;
+   nParentId = AdjustId( nParentId) ;
    bool bOk = true ;
   // recupero il riferimento locale
    Frame3d frLoc ;
@@ -2200,7 +2200,6 @@ ExeCreateSurfBzByExtrusion( int nParentId, int nCrvId, const Vector3d& vtExtr, b
   // porto in locale il vettore estrusione
    Vector3d vtExtrL = GetVectorLocal( pGeomDB, vtExtr, nRefType, frLoc) ;
   // creo la superficie e la inserisco nel DB
-   int nFirstId = GDB_ID_NULL ;
    double dAndTolStdDeg = 15 ;
    Plane3d plPlane ;
    double dArea ;
@@ -2208,7 +2207,7 @@ ExeCreateSurfBzByExtrusion( int nParentId, int nCrvId, const Vector3d& vtExtr, b
    pCrv->ApproxWithLines( dLinTol, dAndTolStdDeg, ICurve::APL_STD, plApprox) ;
    double dOrthoExtr = 0 ;
    if ( bCapEnds  &&  plApprox.IsClosedAndFlat( plPlane, dArea, 50 * EPS_SMALL)){
-      dOrthoExtr = plPlane.GetVersN() * vtExtr ;
+      dOrthoExtr = plPlane.GetVersN() * vtExtrL ;
       if ( ( abs( dOrthoExtr) < EPS_SMALL))
          return GDB_ID_NULL ;
       if ( dOrthoExtr < 0)
@@ -2218,21 +2217,31 @@ ExeCreateSurfBzByExtrusion( int nParentId, int nCrvId, const Vector3d& vtExtr, b
    PtrOwner<ISurfBezier> pSbz( bOk ? GetSurfBezierByExtrusion( pCrv, vtExtrL, false, dLinTol) : nullptr ) ;
    bOk = bOk && ! IsNull( pSbz) ;
   // inserisco la superficie nel DB
-   int nNewId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pSbz)) : GDB_ID_NULL) ;
-   bOk = bOk && ( nNewId != GDB_ID_NULL) ;
-
+   int nFirstId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pSbz)) : GDB_ID_NULL) ;
+   bOk = bOk && ( nFirstId != GDB_ID_NULL) ;
+   int nCount = ( bOk ? 1 : 0) ;
   // se richiesta chiusura agli estremi
-   if ( bCapEnds  &&  bOk) {
+   if ( bOk  &&  bCapEnds) {
       PtrOwner<ISurfBezier> pSrfBzTop( CreateSurfBezier()) ;
-      pSrfBzTop->CreateByFlatContour( plApprox) ;
-      pSrfBzTop->Translate( vtExtrL) ;
-      pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pSrfBzTop)) ;
+      bOk = ( ! IsNull( pSrfBzTop)  &&
+              pSrfBzTop->CreateByFlatContour( plApprox)  &&
+              pSrfBzTop->Translate( vtExtrL)) ;
+      int nTopId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pSrfBzTop)) : GDB_ID_NULL) ;
       PtrOwner<ISurfBezier> pSrfBzBottom( CreateSurfBezier()) ;
-      pSrfBzBottom->CreateByFlatContour( plApprox) ;
-      pSrfBzBottom->Invert() ;
-      pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pSrfBzBottom)) ;
+      bOk = ( ! IsNull( pSrfBzBottom)  &&
+              pSrfBzBottom->CreateByFlatContour( plApprox)  &&
+              pSrfBzBottom->Invert()) ;
+      int nBotId = ( bOk ? pGeomDB->AddGeoObj( GDB_ID_NULL, nParentId, Release( pSrfBzBottom)) : GDB_ID_NULL) ;
+      if ( nTopId == GDB_ID_NULL  ||  nBotId == GDB_ID_NULL) {
+         pGeomDB->Erase( nFirstId) ;
+         pGeomDB->Erase( nTopId) ;
+         pGeomDB->Erase( nBotId) ;
+         nFirstId = GDB_ID_NULL ;
+         nCount = 0 ;
+      }
    }
-
+   if ( pnCount != nullptr)
+      *pnCount = nCount ;
    ExeSetModified() ;
   // se richiesto, salvo il comando Lua equivalente
    if ( IsCmdLog()) {
@@ -2242,7 +2251,7 @@ ExeCreateSurfBzByExtrusion( int nParentId, int nCrvId, const Vector3d& vtExtr, b
                                               ( bCapEnds ? "true" : "false") + "," +
                                               ToString( dLinTol) + "," +
                                               RefTypeToString( nRefType) + ")" +
-                    " -- Id=" + ToString( nFirstId) ;
+                    " -- Id=" + ToString( nFirstId) + ",Nbr=" + ToString( nCount) ;
       LOG_INFO( GetCmdLogger(), sLua.c_str()) ;
    }
   // restituisco l'identificativo della nuova entità
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 3473e12..5a3e372 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbCreateSurf.cpp b/LUA_GdbCreateSurf.cpp
index 2d88ffc..a96b2c0 100644
--- a/LUA_GdbCreateSurf.cpp
+++ b/LUA_GdbCreateSurf.cpp
@@ -1165,7 +1165,7 @@ LuaCreateSurfBzByRegion( lua_State* L)
 static int
 LuaCreateSurfBzByExtrusion( lua_State* L)
 {
-   // 3 o 4 o 5 o 6  parametri : ParentId, CrvId, vtExtr [, bool bCapEnds] [, dTol] [, nRefType]
+  // 3 o 4 o 5 o 6  parametri : ParentId, CrvId, vtExtr [, bool bCapEnds] [, dTol] [, nRefType]
    int nParentId ;
    LuaCheckParam( L, 1, nParentId)
    int nCrvId ;
@@ -1182,14 +1182,16 @@ LuaCreateSurfBzByExtrusion( lua_State* L)
    int nRefType = RTY_DEFAULT ;
    LuaGetParam( L, nPar, nRefType) ;
    LuaClearStack( L) ;
-   // creo STM estrudendo uno o più percorsi, se piani si possono mettere i tappi
-   int nId = ExeCreateSurfBzByExtrusion( nParentId, nCrvId, vtExtr, bCapEnds, dLinTol, nRefType) ;
+  // creo SurfBezier estrudendo un percorso, se piano si possono mettere i tappi
+   int nCount = 0 ;
+   int nId = ExeCreateSurfBzByExtrusion( nParentId, nCrvId, vtExtr, bCapEnds, dLinTol, nRefType, &nCount) ;
    // restituisco il risultato
    if ( nId != GDB_ID_NULL)
       LuaSetParam( L, nId) ;
    else
       LuaSetParam( L) ;
-   return 1 ;
+   LuaSetParam( L, nCount) ;
+   return 2 ;
 }
 
 //-------------------------------------------------------------------------------