diff --git a/examples/ClientTests/compact/Issue_786.xml b/examples/ClientTests/compact/Issue_786.xml
new file mode 100644
index 0000000000000000000000000000000000000000..7a5f4d730b0f080a2d48fac0cdf5df50266e3a80
--- /dev/null
+++ b/examples/ClientTests/compact/Issue_786.xml
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<lccdd>
+<!-- #==========================================================================
+ # AIDA Detector description implementation
+ #==========================================================================
+ # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+ # All rights reserved.
+ #
+ # For the licensing terms see $DD4hepINSTALL/LICENSE.
+ # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+ #
+ #==========================================================================
+-->
+
+ <includes>
+ <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
+ <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
+ </includes>
+
+ <define>
+ <constant name="world_size" value="30*m"/>
+ <constant name="world_x" value="world_size"/>
+ <constant name="world_y" value="world_size"/>
+ <constant name="world_z" value="world_size"/>
+ </define>
+
+ <display>
+ <vis name="Shape0_vis" alpha="0.75" r="0" g="1" b="1" showDaughters="true" visible="true"/>
+ <vis name="Shape1_vis" alpha="0.75" r="1" g="0" b="0" showDaughters="true" visible="true"/>
+ <vis name="Shape2_vis" alpha="0.75" r="0" g="1" b="0" showDaughters="true" visible="true"/>
+ <vis name="Shape3_vis" alpha="0.75" r="0" g="0" b="1" showDaughters="true" visible="true"/>
+ <vis name="Shape4_vis" alpha="0.75" r="1" g="1" b="0" showDaughters="true" visible="true"/>
+ <vis name="Shape5_vis" alpha="0.75" r="1" g="0" b="1" showDaughters="true" visible="true"/>
+ <vis name="Shape_grey" alpha="0.5" r="0.0" g="0.4" b="0.4" showDaughters="true" visible="true"/>
+ </display>
+
+ <detectors>
+ <detector id="1" name="Issue" type="Issue_786" readout="IssueHits" vis="Shape_grey"/>
+ </detectors>
+
+ <readouts>
+ <readout name="IssueHits">
+ <id>system:8,node:3,parent:3,container:4,child:2</id>
+ </readout>
+ </readouts>
+
+ <fields>
+ <field name="GlobalSolenoid" type="solenoid"
+ inner_field="5.0*tesla"
+ outer_field="-1.5*tesla"
+ zmax="2*m"
+ outer_radius="3*m">
+ </field>
+ </fields>
+
+</lccdd>
diff --git a/examples/ClientTests/scripts/Issue_786.py b/examples/ClientTests/scripts/Issue_786.py
new file mode 100644
index 0000000000000000000000000000000000000000..52e89ddacfa58010cdbe57cbf898c52f143be803
--- /dev/null
+++ b/examples/ClientTests/scripts/Issue_786.py
@@ -0,0 +1,98 @@
+# ==========================================================================
+# AIDA Detector description implementation
+# --------------------------------------------------------------------------
+# Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+# All rights reserved.
+#
+# For the licensing terms see $DD4hepINSTALL/LICENSE.
+# For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+#
+# ==========================================================================
+#
+#
+from __future__ import absolute_import, unicode_literals
+import os
+import sys
+import time
+import DDG4
+from DDG4 import OutputLevel as Output
+from g4units import GeV, MeV, m
+#
+#
+"""
+
+ dd4hep simulation example setup using the python configuration
+
+ @author M.Frank
+ @version 1.0
+
+"""
+
+
+def run():
+ kernel = DDG4.Kernel()
+ install_dir = os.environ['DD4hepExamplesINSTALL']
+ kernel.loadGeometry(str("file:" + install_dir + "/examples/ClientTests/compact/Issue_786.xml"))
+ DDG4.importConstants(kernel.detectorDescription(), debug=False)
+ geant4 = DDG4.Geant4(kernel, tracker='Geant4TrackerCombineAction')
+ geant4.printDetectors()
+ # Configure UI
+ if len(sys.argv) > 1:
+ geant4.setupCshUI(macro=sys.argv[1])
+ else:
+ geant4.setupCshUI()
+
+ # Configure field
+ geant4.setupTrackingField(prt=True)
+ # Configure Event actions
+ prt = DDG4.EventAction(kernel, 'Geant4ParticlePrint/ParticlePrint')
+ prt.OutputLevel = Output.DEBUG
+ prt.OutputType = 3 # Print both: table and tree
+ kernel.eventAction().adopt(prt)
+
+ generator_output_level = Output.INFO
+
+ # Configure G4 geometry setup
+ seq, act = geant4.addDetectorConstruction("Geant4DetectorGeometryConstruction/ConstructGeo")
+ act.DebugMaterials = False
+ act.DebugElements = False
+ act.DebugVolumes = True
+ act.DebugShapes = True
+ act.DebugPlacements = True
+
+ # Configure I/O
+ geant4.setupROOTOutput('RootOutput', 'Issue_' + time.strftime('%Y-%m-%d_%H-%M'))
+
+ # Setup particle gun
+ gun = geant4.setupGun("Gun", particle='mu-', energy=20 * GeV, multiplicity=1)
+ gun.OutputLevel = generator_output_level
+
+ # And handle the simulation particles.
+ part = DDG4.GeneratorAction(kernel, "Geant4ParticleHandler/ParticleHandler")
+ kernel.generatorAction().adopt(part)
+ part.SaveProcesses = ['Decay']
+ part.MinimalKineticEnergy = 100 * MeV
+ part.OutputLevel = Output.INFO # generator_output_level
+ part.enableUI()
+ user = DDG4.Action(kernel, "Geant4TCUserParticleHandler/UserParticleHandler")
+ user.TrackingVolume_Zmax = 3.0 * m
+ user.TrackingVolume_Rmax = 3.0 * m
+ user.enableUI()
+ part.adopt(user)
+
+ geant4.setupTracker('Issue')
+
+ # Now build the physics list:
+ phys = geant4.setupPhysics('QGSP_BERT')
+ ph = DDG4.PhysicsList(kernel, str('Geant4PhysicsList/Myphysics'))
+ ph.addParticleConstructor(str('G4Geantino'))
+ ph.addParticleConstructor(str('G4BosonConstructor'))
+ ph.enableUI()
+ phys.adopt(ph)
+ phys.dump()
+
+ geant4.execute()
+
+
+if __name__ == "__main__":
+ run()
diff --git a/examples/ClientTests/src/Issue_786_geo.cpp b/examples/ClientTests/src/Issue_786_geo.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7d843aa49ace868d8059c19bbcb49a5d670433c1
--- /dev/null
+++ b/examples/ClientTests/src/Issue_786_geo.cpp
@@ -0,0 +1,66 @@
+//==========================================================================
+// AIDA Detector description implementation
+//--------------------------------------------------------------------------
+// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+// All rights reserved.
+//
+// For the licensing terms see $DD4hepINSTALL/LICENSE.
+// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+//
+// Author : M.Frank
+//
+//==========================================================================
+
+// Framework includes
+#include "DD4hep/DetFactoryHelper.h"
+
+using namespace dd4hep;
+using namespace dd4hep::detail;
+
+static Ref_t create_detector(Detector& description, xml_h e, SensitiveDetector sens) {
+ xml_dim_t x_det = e;
+ DetElement det(x_det.nameStr(),x_det.id());
+
+ Volume node( "node", Box(170, 70, 70), description.air());
+ Volume otherParent("otherparent", Box( 50, 50, 50), description.air());
+ Volume otherNode( "othernode", Box(100, 50, 50), description.material("Iron"));
+ Volume parent( "parent", Box(90, 40, 40), description.material("Iron"));
+ Volume container( "container", Box(30, 30, 30), description.air());
+ Volume child( "child", Box(20, 20, 20), description.material("Iron"));
+
+ sens.setType("tracker");
+
+ node.setVisAttributes( description, x_det.visStr());
+ otherParent.setVisAttributes( description, "Shape0_vis");
+ otherNode.setVisAttributes( description, "Shape1_vis");
+ parent.setVisAttributes( description, "Shape2_vis");
+ container.setVisAttributes( description, "Shape3_vis");
+ child.setVisAttributes( description, "Shape4_vis");
+ child.setSensitiveDetector(sens);
+
+ auto pv = container.placeVolume( child );
+ pv.addPhysVolID( "child", 0);
+ pv = parent.placeVolume( container, Position( 45, 0, 0) );
+ pv.addPhysVolID( "container", 0);
+ pv = parent.placeVolume( container, Position(-45, 0, 0) );
+ pv.addPhysVolID( "container", 1);
+ pv = otherNode.placeVolume( parent );
+ pv.addPhysVolID( "parent", 0);
+ pv = node.placeVolume( otherNode, Position( 60, 0, 0) );
+ pv.addPhysVolID( "node", 0);
+
+ pv = otherParent.placeVolume( container );
+ pv.addPhysVolID( "container",3);
+ pv.addPhysVolID( "parent", 1);
+ pv = node.placeVolume( otherParent, Position(-110, 0, 0) );
+ pv.addPhysVolID( "node", 1);
+
+ // Place the calo inside the world
+ auto mother = description.pickMotherVolume(det);
+ pv = mother.placeVolume(node);
+ pv.addPhysVolID( "system",x_det.id() );
+ det.setPlacement(pv);
+ return det;
+}
+
+DECLARE_DETELEMENT(Issue_786,create_detector)