diff --git a/DDCore/include/DD4hep/objects/DetectorInterna.h b/DDCore/include/DD4hep/objects/DetectorInterna.h
index 9d66d8004e3d05d84c46510d0c6ca4bfa17515a7..5e5e69b2e212a602089c5e4a336e64e2424142ea 100644
--- a/DDCore/include/DD4hep/objects/DetectorInterna.h
+++ b/DDCore/include/DD4hep/objects/DetectorInterna.h
@@ -167,16 +167,19 @@ namespace DD4hep {
       std::vector<Alignment> volume_surveys;
 #endif
 
-      //@{ Cached information of the detector element
+      //@{ Cached information of the detector element.
+      /// The usage is deprecated and only present for backwards compatibility
     private:
       friend class VolumeManager_Populator;
       /// Intermediate buffer to store the transformation to the world coordination system
       TGeoHMatrix worldTrafo;
       /// Intermediate buffer to store the transformation to the parent detector element
       TGeoHMatrix parentTrafo;
-      //@}
       /// Create cached matrix to transform to parent coordinates
-      const TGeoHMatrix& parentTransformation();
+      const TGeoHMatrix& __parentTransformation();
+      /// Create cached matrix to transform to world coordinates
+      const TGeoHMatrix& __worldTransformation();
+      //@}
 
     private:
       //@{ Private methods used internally by the object itself. */
@@ -198,8 +201,6 @@ namespace DD4hep {
       {  return privateWorld.isValid() ? privateWorld : i_access_world(); }
       ConditionsContainer assign_conditions();
       //@}
-      /// Create cached matrix to transform to world coordinates
-      const TGeoHMatrix& worldTransformation();
       /// Remove callback from object
       void removeAtUpdate(unsigned int type, void* pointer);
       /// Trigger update callbacks
diff --git a/DDCore/src/Detector.cpp b/DDCore/src/Detector.cpp
index 0d1b6a3cc99ae0c8f64d6fa97621d77300f6213a..99f1066eb6868e8ecc4ed0aab13dcc68ba4b2390 100644
--- a/DDCore/src/Detector.cpp
+++ b/DDCore/src/Detector.cpp
@@ -358,40 +358,40 @@ const TGeoHMatrix& DetElement::parentTransformation() const   {
 
 /// Transformation from local coordinates of the placed volume to the world system
 bool DetElement::localToWorld(const Position& local, Position& global) const {
-  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal()",__PRETTY_FUNCTION__);
+  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal() member functions",__PRETTY_FUNCTION__);
   Double_t master_point[3] = { 0, 0, 0 }, local_point[3] = { local.X(), local.Y(), local.Z() };
   // If the path is unknown an exception will be thrown inside worldTransformation() !
-  worldTransformation().LocalToMaster(local_point, master_point);
+  nominal().worldTransformation().LocalToMaster(local_point, master_point);
   global.SetCoordinates(master_point);
   return true;
 }
 
 /// Transformation from local coordinates of the placed volume to the parent system
 bool DetElement::localToParent(const Position& local, Position& global) const {
-  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal()",__PRETTY_FUNCTION__);
-  // If the path is unknown an exception will be thrown inside parentTransformation() !
+  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal() member functions",__PRETTY_FUNCTION__);
+  // If the path is unknown an exception will be thrown inside detectorTransformation() !
   Double_t master_point[3] = { 0, 0, 0 }, local_point[3] = { local.X(), local.Y(), local.Z() };
-  parentTransformation().LocalToMaster(local_point, master_point);
+  nominal().detectorTransformation().LocalToMaster(local_point, master_point);
   global.SetCoordinates(master_point);
   return true;
 }
 
 /// Transformation from world coordinates of the local placed volume coordinates
 bool DetElement::worldToLocal(const Position& global, Position& local) const {
-  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal()",__PRETTY_FUNCTION__);
+  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal() member functions",__PRETTY_FUNCTION__);
   // If the path is unknown an exception will be thrown inside worldTransformation() !
   Double_t master_point[3] = { global.X(), global.Y(), global.Z() }, local_point[3] = { 0, 0, 0 };
-  worldTransformation().MasterToLocal(master_point, local_point);
+  nominal().worldTransformation().MasterToLocal(master_point, local_point);
   local.SetCoordinates(local_point);
   return true;
 }
 
 /// Transformation from parent coordinates of the local placed volume coordinates
 bool DetElement::parentToLocal(const Position& global, Position& local) const {
-  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal()",__PRETTY_FUNCTION__);
-  // If the path is unknown an exception will be thrown inside parentTransformation() !
+  DD4HEP_DEPRECATED_CALL("DetElement","DetElement::nominal() member functions",__PRETTY_FUNCTION__);
+  // If the path is unknown an exception will be thrown inside detectorTransformation() !
   Double_t master_point[3] = { global.X(), global.Y(), global.Z() }, local_point[3] = { 0, 0, 0 };
-  parentTransformation().MasterToLocal(master_point, local_point);
+  nominal().detectorTransformation().MasterToLocal(master_point, local_point);
   local.SetCoordinates(local_point);
   return true;
 }
diff --git a/DDCore/src/DetectorInterna.cpp b/DDCore/src/DetectorInterna.cpp
index 12739934080f24b6ab569d51e825d69c26591e77..74b2dc0bc4b4b6695f303f78c617a09addadfc64 100644
--- a/DDCore/src/DetectorInterna.cpp
+++ b/DDCore/src/DetectorInterna.cpp
@@ -152,8 +152,8 @@ World DetElementObject::i_access_world()   {
 }
 
 /// Create cached matrix to transform to world coordinates
-const TGeoHMatrix& DetElementObject::worldTransformation() {
-  DD4HEP_DEPRECATED_CALL("DetElementObject","DetElement::nominal()",__PRETTY_FUNCTION__);
+const TGeoHMatrix& DetElementObject::__worldTransformation() {
+  //DD4HEP_DEPRECATED_CALL("DetElementObject","DetElement::nominal()",__PRETTY_FUNCTION__);
   if ( (flag&HAVE_WORLD_TRAFO) == 0 ) {
     PlacementPath nodes;
     flag |= HAVE_WORLD_TRAFO;
@@ -164,8 +164,8 @@ const TGeoHMatrix& DetElementObject::worldTransformation() {
 }
 
 /// Create cached matrix to transform to parent coordinates
-const TGeoHMatrix& DetElementObject::parentTransformation() {
-  DD4HEP_DEPRECATED_CALL("DetElementObject","DetElement::nominal()",__PRETTY_FUNCTION__);
+const TGeoHMatrix& DetElementObject::__parentTransformation() {
+  //DD4HEP_DEPRECATED_CALL("DetElementObject","DetElement::nominal()",__PRETTY_FUNCTION__);
   if ( (flag&HAVE_PARENT_TRAFO) == 0 ) {
     PlacementPath nodes;
     flag |= HAVE_PARENT_TRAFO;
diff --git a/DDCore/src/VolumeManager.cpp b/DDCore/src/VolumeManager.cpp
index be00cbe6d31e9350b5ca4f6bdffa12b36e65119c..5fd9b37bce1ed5e8b368cf0b1150b6119f37ff61 100644
--- a/DDCore/src/VolumeManager.cpp
+++ b/DDCore/src/VolumeManager.cpp
@@ -33,7 +33,12 @@ namespace DD4hep {
   /// Namespace for the geometry part of the AIDA detector description toolkit
   namespace Geometry {
 
-    struct VolumeManager_Populator {
+    /// Helper class to populate the volume manager
+    /**
+     *  \author  M.Frank
+     *  \version 1.0
+     */
+    class VolumeManager_Populator {
       typedef PlacedVolume::VolIDs VolIDs;
       typedef vector<TGeoNode*> Chain;
       typedef pair<VolumeID, VolumeID> Encoding;
@@ -43,6 +48,8 @@ namespace DD4hep {
       VolumeManager m_volManager;
       /// Set of already added entries
       set<VolumeID> m_entries;
+
+    public:
       /// Default constructor
       VolumeManager_Populator(LCDD& lcdd, VolumeManager vm)
         : m_lcdd(lcdd), m_volManager(vm) {
@@ -326,7 +333,7 @@ namespace DD4hep {
             }
             {
               double epsilon = 1e-12;
-              const Double_t* t1 = e->worldTransformation().GetTranslation();
+              const Double_t* t1 = e->__worldTransformation().GetTranslation();
               const Double_t* t2 = e.nominal().worldTransformation().GetTranslation();
               for(int i=0; i<3; ++i)   {
                 if ( std::fabs(t1[i]-t2[i]) > epsilon )  {
@@ -344,7 +351,7 @@ namespace DD4hep {
                   break;
                 }
               }
-              const Double_t* r1 = e->worldTransformation().GetRotationMatrix();
+              const Double_t* r1 = e->__worldTransformation().GetRotationMatrix();
               const Double_t* r2 = e.nominal().worldTransformation().GetRotationMatrix();
               for(int i=0; i<9; ++i)   {
                 if ( std::fabs(r1[i]-r2[i]) > epsilon )  {
@@ -365,7 +372,7 @@ namespace DD4hep {
             }
             {
               double epsilon = 1e-12;
-              const Double_t* t1 = e->parentTransformation().GetTranslation();
+              const Double_t* t1 = e->__parentTransformation().GetTranslation();
               const Double_t* t2 = e.nominal().detectorTransformation().GetTranslation();
               for(int i=0; i<3; ++i)   {
                 if ( std::fabs(t1[i]-t2[i]) > epsilon )  {
@@ -383,7 +390,7 @@ namespace DD4hep {
                   break;
                 }
               }
-              const Double_t* r1 = e->parentTransformation().GetRotationMatrix();
+              const Double_t* r1 = e->__parentTransformation().GetRotationMatrix();
               const Double_t* r2 = e.nominal().detectorTransformation().GetRotationMatrix();
               for(int i=0; i<9; ++i)   {
                 if ( std::fabs(r1[i]-r2[i]) > epsilon )  {
@@ -437,7 +444,7 @@ namespace DD4hep {
             }
             context->toDetector = context->toWorld;
             context->toDetector.MultiplyLeft(nodes[0]->GetMatrix());
-            context->toWorld.MultiplyLeft(&parent->worldTransformation());
+            context->toWorld.MultiplyLeft(&parent.worldTransformation());
             //context->toWorld.MultiplyLeft(&parent.nominal().worldTransformation());
             if (!section.adoptPlacement(context)) {
               print_node(sd, parent, e, n, ids, nodes);