diff --git a/src/lib/hash-indexed.hpp b/src/lib/hash-indexed.hpp
index 4294f69fa..8dedfd33f 100644
--- a/src/lib/hash-indexed.hpp
+++ b/src/lib/hash-indexed.hpp
@@ -137,7 +137,7 @@ namespace lib {
       struct ID : IMP
         {
           ID ()              : IMP ()            {}
-          ID (BA const& ref) : IMP (ref.getID()) {}
+          ID (BA const& ref) : IMP (ref.getID()) {}   // note: automatic conversion (e.g. from PlacementMO&)
           ID (IMP const& ir) : IMP (ir)          {}
         };
       
diff --git a/src/proc/mobject/placement-ref.hpp b/src/proc/mobject/placement-ref.hpp
index 0cce33c24..209f5080b 100644
--- a/src/proc/mobject/placement-ref.hpp
+++ b/src/proc/mobject/placement-ref.hpp
@@ -53,6 +53,7 @@
  **       (which in the mentioned example would mean it couldn't be
  **       passed to a API function expecting a Placement<Meta>).
  **       This is ugly, but doesn't seem to bear any danger.
+ ** @todo better solution for the ID to type connection ///////////////////////TICKET #523
  **
  ** @see Placement
  ** @see PlacementRef_test
diff --git a/src/proc/mobject/session/placement-index.hpp b/src/proc/mobject/session/placement-index.hpp
index 2da6540b0..8323b6cbb 100644
--- a/src/proc/mobject/session/placement-index.hpp
+++ b/src/proc/mobject/session/placement-index.hpp
@@ -132,6 +132,22 @@ namespace session {
   using boost::scoped_ptr;
   
   
+  /**
+   * Helper for building Placement-ID types
+   * @todo this is a rather half-baked solution //////////TICKET #523
+   */
+  template<typename PLA>
+  struct BuildID;
+  
+  /// @note just ignoring the second (parent) type encoded into Placement
+  template<typename MO, typename BMO>
+  struct BuildID<Placement<MO,BMO> >
+    {
+      typedef PlacementMO::Id<MO> Type;
+      typedef MO                  Target;
+    };
+  
+  
   
   /**
    * Structured compound of Placement instances
@@ -199,6 +215,9 @@ namespace session {
       bool remove (PlacementMO&);
       bool remove (ID);
       
+      template<class PLA>
+      typename BuildID<PLA>::Type insert (PLA const&, ID);
+      
       
       
       PlacementIndex(PlacementMO const&);
@@ -251,7 +270,7 @@ namespace session {
   inline Placement<MO>&
   PlacementIndex::find (PlacementMO::Id<MO> id)  const
   {
-    PlacementMO& result (find (id));
+    PlacementMO& result (find ((ID)id));
     
     ___check_compatibleType<MO> (result);
     return static_cast<Placement<MO>&> (result);
@@ -273,12 +292,31 @@ namespace session {
     return getScope(p.getID()); 
   }
   
+  
   inline bool
   PlacementIndex::contains (PlacementMO const& p)  const
   {
     return contains (p.getID());
   }
   
+  
+  /** convenience shortcut to insert a placement
+   *  immediately followed by creating a typed-ID,
+   *  allowing to retain the original typed context
+   *  @todo this solution is half-baked   ///////////////////////////////////TICKET #523
+   */
+  template<class PLA>
+  typename BuildID<PLA>::Type
+  PlacementIndex::insert (PLA const& newObj, ID targetScope)
+  {
+    typedef typename BuildID<PLA>::Target TargetMO;
+    PlacementMO const& genericPlacement(newObj);
+    
+    return find (insert (genericPlacement, targetScope))
+           .template recastID<TargetMO>();
+  }
+  
+  
   inline bool
   PlacementIndex::remove (PlacementMO& p)
   {
diff --git a/tests/43session.tests b/tests/43session.tests
index c2a181650..c54f2a315 100644
--- a/tests/43session.tests
+++ b/tests/43session.tests
@@ -57,6 +57,8 @@ END
 
 TEST "PlacementIndex_test" PlacementIndex_test <<END
 out: ^::Placement<.+session.test.TestClip.+ use-cnt=2
+out: ^ ::Placement<.+session.test.TestClip.+ use-cnt=1
+out: ^ ...1 elements at Level 1
 out: ^::Placement<.+session.test.TestClip.+ use-cnt=6
 out: ^ ::Placement<.+session.test.TestClip.+ use-cnt=6
 out: ^  ::Placement<.+session.test.TestClip.+ use-cnt=6
diff --git a/tests/components/backend/mediaaccessmock.cpp b/tests/components/backend/mediaaccessmock.cpp
index 718bc55ee..dc07b49d5 100644
--- a/tests/components/backend/mediaaccessmock.cpp
+++ b/tests/components/backend/mediaaccessmock.cpp
@@ -59,7 +59,7 @@ namespace backend_interface
   typedef MediaAccessFacade::ChanHandle ChanHandle;
 
 
-    namespace // implementation deatils
+    namespace // implementation details
       {
       typedef vector<ChanDesc> Response;
       const ChanDesc NULLResponse;
diff --git a/tests/components/proc/mobject/session/placement-index-test.cpp b/tests/components/proc/mobject/session/placement-index-test.cpp
index ad117cdf8..749c32a70 100644
--- a/tests/components/proc/mobject/session/placement-index-test.cpp
+++ b/tests/components/proc/mobject/session/placement-index-test.cpp
@@ -26,6 +26,7 @@
 #include "proc/mobject/session/placement-index.hpp"
 #include "proc/mobject/session/scope.hpp"
 #include "proc/mobject/placement.hpp"
+#include "proc/asset/media.hpp"
 #include "lib/util.hpp"
 
 #include "proc/mobject/session/testclip.hpp"
@@ -70,15 +71,19 @@ namespace test    {
           checkSimpleInsertRemove (index);
           has_size (0, index);
           
-          checkSimpleAccess (index);
+          PMO::ID elmID = checkSimpleAccess (index);
+          ASSERT (index.isValid());
           has_size (2, index);
           
+          checkTypedAccess (index, elmID);
+          has_size (3, index);
+          
           checkScopeHandling (index);
-          has_size (8, index);
+          has_size (9, index);
           
           checkContentsEnumeration (index);
           
-          has_size (8, index);
+          has_size (9, index);
           ASSERT (index.isValid());
           
           index.clear();
@@ -115,7 +120,7 @@ namespace test    {
         }
       
       
-      void
+      PMO::ID
       checkSimpleAccess (Idx index)
         {
           PMO testObj = TestClip::create();
@@ -143,6 +148,34 @@ namespace test    {
           
           // can also re-access objects by previous ref
           ASSERT ( isSameObject (elm, index.find(elm)));
+          return elmID;
+        }
+      
+      
+           
+      void
+      checkTypedAccess (Idx index, PMO::ID elmID)
+        {
+          PMO& elm = index.find(elmID);
+          ASSERT (elmID == elm.getID());
+          
+          typedef Placement<Clip> PClip;
+          PClip anotherTestClip = TestClip::create();
+          
+          typedef PlacementMO::Id<Clip> IDClip;
+          IDClip clipID = index.insert(anotherTestClip, elmID);
+          // retaining the more specific type info
+          
+          // access as MObject...
+          PMO::ID mID = clipID;
+          PMO& asMO = index.find(mID);
+          
+          // access as Clip
+          PClip& asClip = index.find(clipID);
+          ASSERT (LENGTH_TestClip == asClip->getMedia()->getLength());  // using the Clip API
+          
+          ASSERT ( isSameObject(asMO,asClip));
+          ASSERT (!isSameObject(asClip, anotherTestClip)); // always inserting a copy into the PlacementIndex
         }
       
       
diff --git a/tests/components/proc/mobject/session/testclip.cpp b/tests/components/proc/mobject/session/testclip.cpp
index a506d2849..a94e3b0ec 100644
--- a/tests/components/proc/mobject/session/testclip.cpp
+++ b/tests/components/proc/mobject/session/testclip.cpp
@@ -32,6 +32,7 @@ namespace mobject {
 namespace session {
 namespace test    {
   
+  using lumiera::Time;
   typedef shared_ptr<asset::Media> PM;
   typedef backend_interface::MediaAccessFacade MAF;
   using backend_interface::test::MediaAccessMock;
@@ -82,5 +83,9 @@ namespace test    {
   }
   
   
+  /* == define some data for verification in unit tests == */
+  
+  const Time LENGTH_TestClip = Time(25);   //////TODO hard wired as of (1/10). See MediaFactory::operator()  in media.cpp
+  
   
 }}} // namespace mobject::session::test
diff --git a/tests/components/proc/mobject/session/testclip.hpp b/tests/components/proc/mobject/session/testclip.hpp
index 34fa5154f..7b4b66108 100644
--- a/tests/components/proc/mobject/session/testclip.hpp
+++ b/tests/components/proc/mobject/session/testclip.hpp
@@ -26,13 +26,11 @@
 
 
 #include "proc/mobject/session/clip.hpp"
-//#include "lib/util.hpp"
+#include "lib/lumitime.hpp"
 
 
-//#include <boost/format.hpp>
 
 using std::tr1::shared_ptr;
-//using boost::format;
 using std::string;
 
 
@@ -79,6 +77,9 @@ namespace test    {
   }
   
   
+  /* == some test data to check == */
+  extern const lumiera::Time LENGTH_TestClip;
+  
   
 }}} // namespace mobject::session::test
 #endif