diff --git a/src/RWStepShape/RWStepShape_RWManifoldSolidBrep.cxx b/src/RWStepShape/RWStepShape_RWManifoldSolidBrep.cxx
index 91313b9ff7..6f6eaf0537 100644
--- a/src/RWStepShape/RWStepShape_RWManifoldSolidBrep.cxx
+++ b/src/RWStepShape/RWStepShape_RWManifoldSolidBrep.cxx
@@ -43,9 +43,9 @@ void RWStepShape_RWManifoldSolidBrep::ReadStep
 
 	// --- own field : outer ---
 
-	Handle(StepShape_ClosedShell) aOuter;
+	Handle(StepShape_ConnectedFaceSet) aOuter;
 	//szv#4:S4163:12Mar99 `Standard_Boolean stat2 =` not needed
-	data->ReadEntity(num, 2,"outer", ach, STANDARD_TYPE(StepShape_ClosedShell), aOuter);
+	data->ReadEntity(num, 2,"outer", ach, STANDARD_TYPE(StepShape_ConnectedFaceSet), aOuter);
 
 	//--- Initialisation of the read entity ---
 
diff --git a/src/STEPCAFControl/STEPCAFControl_Reader.cxx b/src/STEPCAFControl/STEPCAFControl_Reader.cxx
index 73f8577798..57202a010a 100644
--- a/src/STEPCAFControl/STEPCAFControl_Reader.cxx
+++ b/src/STEPCAFControl/STEPCAFControl_Reader.cxx
@@ -2184,7 +2184,7 @@ void STEPCAFControl_Reader::ExpandManifoldSolidBrep(TDF_Label& ShapeLab,
 {
   // Access outer shell
   Handle(StepShape_ManifoldSolidBrep) aMSB = Handle(StepShape_ManifoldSolidBrep)::DownCast(Repr);
-  Handle(StepShape_ClosedShell) aShell = aMSB->Outer();
+  Handle(StepShape_ConnectedFaceSet) aShell = aMSB->Outer();
 
   // Expand shell contents to CAF tree
   ExpandShell(aShell, ShapeLab, TP, ShapeTool);
diff --git a/src/StepShape/StepShape_ManifoldSolidBrep.cdl b/src/StepShape/StepShape_ManifoldSolidBrep.cdl
index ef0186ec84..71e524fdd4 100644
--- a/src/StepShape/StepShape_ManifoldSolidBrep.cdl
+++ b/src/StepShape/StepShape_ManifoldSolidBrep.cdl
@@ -20,6 +20,7 @@ inherits SolidModel from StepShape
 
 uses
 
+	ConnectedFaceSet from StepShape, 
 	ClosedShell from StepShape, 
 	HAsciiString from TCollection
 is
@@ -35,13 +36,17 @@ is
 	      aName : HAsciiString from TCollection;
 	      aOuter : ClosedShell from StepShape) is virtual;
 
+	Init (me : mutable;
+	      aName : HAsciiString from TCollection;
+	      aOuter : ConnectedFaceSet from StepShape) is virtual;
+
 	-- Specific Methods for Field Data Access --
 
-	SetOuter(me : mutable; aOuter : ClosedShell);
-	Outer (me) returns ClosedShell;
+	SetOuter(me : mutable; aOuter : ConnectedFaceSet);
+	Outer (me) returns ConnectedFaceSet;
 
 fields
 
-	outer : ClosedShell from StepShape;
+	outer : ConnectedFaceSet from StepShape;
 
 end ManifoldSolidBrep;
diff --git a/src/StepShape/StepShape_ManifoldSolidBrep.cxx b/src/StepShape/StepShape_ManifoldSolidBrep.cxx
index ab6e04d9cc..46f491faef 100644
--- a/src/StepShape/StepShape_ManifoldSolidBrep.cxx
+++ b/src/StepShape/StepShape_ManifoldSolidBrep.cxx
@@ -23,9 +23,19 @@ void StepShape_ManifoldSolidBrep::Init(
 	StepRepr_RepresentationItem::Init(aName);
 }
 
+void StepShape_ManifoldSolidBrep::Init(
+  const Handle(TCollection_HAsciiString)& aName,
+  const Handle(StepShape_ClosedShell)& aOuter)
+{
+  // --- classe own fields ---
+  outer = aOuter;
+  // --- classe inherited fields ---
+  StepRepr_RepresentationItem::Init(aName);
+}
+
 void StepShape_ManifoldSolidBrep::Init(
 	const Handle(TCollection_HAsciiString)& aName,
-	const Handle(StepShape_ClosedShell)& aOuter)
+	const Handle(StepShape_ConnectedFaceSet)& aOuter)
 {
 	// --- classe own fields ---
 	outer = aOuter;
@@ -33,13 +43,12 @@ void StepShape_ManifoldSolidBrep::Init(
 	StepRepr_RepresentationItem::Init(aName);
 }
 
-
-void StepShape_ManifoldSolidBrep::SetOuter(const Handle(StepShape_ClosedShell)& aOuter)
+void StepShape_ManifoldSolidBrep::SetOuter(const Handle(StepShape_ConnectedFaceSet)& aOuter)
 {
 	outer = aOuter;
 }
 
-Handle(StepShape_ClosedShell) StepShape_ManifoldSolidBrep::Outer() const
+Handle(StepShape_ConnectedFaceSet) StepShape_ManifoldSolidBrep::Outer() const
 {
 	return outer;
 }
diff --git a/src/StepToTopoDS/StepToTopoDS_Builder.cxx b/src/StepToTopoDS/StepToTopoDS_Builder.cxx
index e2a27eab98..60a57d908d 100644
--- a/src/StepToTopoDS/StepToTopoDS_Builder.cxx
+++ b/src/StepToTopoDS/StepToTopoDS_Builder.cxx
@@ -192,15 +192,15 @@ void StepToTopoDS_Builder::Init
 
   // Start Mapping
 
-  Handle(StepShape_ClosedShell) aCShell;
-  aCShell = aManifoldSolid->Outer();
+  Handle(StepShape_ConnectedFaceSet) aShell;
+  aShell = aManifoldSolid->Outer();
 
   StepToTopoDS_TranslateShell myTranShell;
   myTranShell.SetPrecision(Precision());
   myTranShell.SetMaxTol(MaxTol());
   // Non-manifold topology is not referenced by ManifoldSolidBrep (ssv; 14.11.2010)
   StepToTopoDS_NMTool dummyNMTool;
-  myTranShell.Init(aCShell, myTool, dummyNMTool);
+  myTranShell.Init(aShell, myTool, dummyNMTool);
 
   if (myTranShell.IsDone()) {
     TopoDS_Shape Sh = myTranShell.Value();
@@ -234,7 +234,7 @@ void StepToTopoDS_Builder::Init
     ResetPreci (S, MaxTol());
   }
   else {
-    TP->AddWarning(aCShell," OuterShell from ManifoldSolidBrep not mapped to TopoDS");
+    TP->AddWarning(aShell," OuterShell from ManifoldSolidBrep not mapped to TopoDS");
     myError  = StepToTopoDS_BuilderOther;
     done     = Standard_False;
   }
@@ -273,7 +273,7 @@ void StepToTopoDS_Builder::Init
   myTranShell.SetMaxTol(MaxTol());
   // OuterBound
 
-  aCShell = aBRepWithVoids->Outer();
+  aCShell = Handle(StepShape_ClosedShell)::DownCast(aBRepWithVoids->Outer());
   // Non-manifold topology is not referenced by BrepWithVoids (ssv; 14.11.2010)
   StepToTopoDS_NMTool dummyNMTool;
   myTranShell.Init(aCShell, myTool, dummyNMTool);
@@ -360,7 +360,7 @@ void StepToTopoDS_Builder::Init(const Handle(StepShape_FacetedBrep)& aFB,
   // Start Mapping
 
   Handle(StepShape_ClosedShell) aCShell;
-  aCShell = aFB->Outer();
+  aCShell = Handle(StepShape_ClosedShell)::DownCast(aFB->Outer());
   TopoDS_Shape Sh;
 
   StepToTopoDS_TranslateShell myTranShell; 
@@ -411,7 +411,7 @@ void StepToTopoDS_Builder::Init
   // Start Mapping
 
   Handle(StepShape_ClosedShell) aCShell;
-  aCShell = aFBABWV->Outer();
+  aCShell = Handle(StepShape_ClosedShell)::DownCast(aFBABWV->Outer());
   TopoDS_Shape Sh;
 
   StepToTopoDS_TranslateShell myTranShell;