diff --git a/AdjustLoops.cpp b/AdjustLoops.cpp
index df4d6f5..af1df8c 100644
--- a/AdjustLoops.cpp
+++ b/AdjustLoops.cpp
@@ -278,7 +278,7 @@ MyAdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst)
 
 //----------------------------------------------------------------------------
 bool
-AdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst)
+AdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst, bool bNeedSameProp)
 {
   // elimino eventuali sovrapposizioni e accostamenti
    if ( ! MyAdjustLoops( pCurve, CrvLst))
@@ -291,7 +291,7 @@ AdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst)
         // elimino eventuali Spikes e Small Z
          pCrvCo->RemoveSmallDefects( 2 * LIN_TOL_MIN, ANG_TOL_STD_DEG, true) ;
         // unisco eventuali tratti allineati
-         pCrvCo->MergeCurves( LIN_TOL_MIN, ANG_TOL_STD_DEG) ;
+         pCrvCo->MergeCurves( LIN_TOL_MIN, ANG_TOL_STD_DEG, true, bNeedSameProp) ;
       }
    }
 
diff --git a/AdjustLoops.h b/AdjustLoops.h
index 78f30c5..463ab93 100644
--- a/AdjustLoops.h
+++ b/AdjustLoops.h
@@ -17,4 +17,4 @@
 
 
 //----------------------------------------------------------------------------
-bool AdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst) ;
+bool AdjustLoops( ICurve* pCurve, ICURVEPLIST& CrvLst, bool bNeedSameProp) ;
diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index a0bf9fe..bd9bfb8 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/SfrCreate.cpp b/SfrCreate.cpp
index 5e7beaf..c3daeb9 100644
--- a/SfrCreate.cpp
+++ b/SfrCreate.cpp
@@ -436,7 +436,7 @@ SurfFlatRegionByContours::AddCurve( ICurve* pCrv)
    pMyCrv->SetThickness( 0) ;
   // rimuovo eventuali sovrapposizioni (calcolate nel suo piano)
    ICURVEPLIST CrvLst ;
-   if ( ! AdjustLoops( Release( pMyCrv), CrvLst))
+   if ( ! AdjustLoops( Release( pMyCrv), CrvLst, true))
       return false ;
   // la/le inserisco nel vettore delle curve
    for ( auto& pSingCrv : CrvLst)
diff --git a/SurfFlatRegion.cpp b/SurfFlatRegion.cpp
index d2bd04a..0fdb481 100644
--- a/SurfFlatRegion.cpp
+++ b/SurfFlatRegion.cpp
@@ -103,7 +103,7 @@ SurfFlatRegion::AddExtLoop( ICurve* pCrv)
    pMyCrv->SetThickness( 0) ;
   // rimuovo eventuali sovrapposizioni (calcolate nel suo piano)
    ICURVEPLIST CrvLst ;
-   if ( ! AdjustLoops( Release( pMyCrv), CrvLst))
+   if ( ! AdjustLoops( Release( pMyCrv), CrvLst, true))
       return false ;
   // aggiungo le singole curve
    bool bOk = true ;
@@ -247,7 +247,7 @@ SurfFlatRegion::AddIntLoop( ICurve* pCrv)
    pMyCrv->SetThickness( 0) ;
   // rimuovo eventuali sovrapposizioni (calcolate nel suo piano)
    ICURVEPLIST CrvLst ;
-   if ( ! AdjustLoops( Release( pMyCrv), CrvLst))
+   if ( ! AdjustLoops( Release( pMyCrv), CrvLst, true))
       return false ;
   // aggiungo le singole curve
    bool bOk = true ;