diff --git a/java/com.sap.sailing.operationaltransformation/src/com/sap/sailing/operationaltransformation/PeerImpl.java b/java/com.sap.sailing.operationaltransformation/src/com/sap/sailing/operationaltransformation/PeerImpl.java
index e3472cf9980..81bd4e099fe 100755
--- a/java/com.sap.sailing.operationaltransformation/src/com/sap/sailing/operationaltransformation/PeerImpl.java
+++ b/java/com.sap.sailing.operationaltransformation/src/com/sap/sailing/operationaltransformation/PeerImpl.java
@@ -5,6 +5,7 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.logging.Logger;
 
 
 /**
@@ -19,6 +20,7 @@ import java.util.concurrent.Executors;
  * @param <S> type of state managed by this server to which the operations can be applied
  */
 public class PeerImpl<O extends Operation<S>, S> implements Peer<O, S> {
+    private static final Logger logger = Logger.getLogger(PeerImpl.class.getName());
     
     private String name;
     
@@ -42,20 +44,20 @@ public class PeerImpl<O extends Operation<S>, S> implements Peer<O, S> {
      * confirmed, the first operation from the queue is removed because operations sent
      * from this peer to the remote peer are processed in order.
      */
-    private Map<Peer<O, S>, UnmergedOperationsQueue<O, S>> unmergedOperationsForPeer = new HashMap<Peer<O, S>, UnmergedOperationsQueue<O, S>>();
+    private final Map<Peer<O, S>, UnmergedOperationsQueue<O, S>> unmergedOperationsForPeer = new HashMap<Peer<O, S>, UnmergedOperationsQueue<O, S>>();
     
     /**
      * Remembers per peer how many of that peer's operations this peer has already
      * applied locally.
      */
-    private Map<Peer<O, S>, Integer> numberOfMergedOperations = new HashMap<Peer<O, S>, Integer>();
+    private final Map<Peer<O, S>, Integer> numberOfMergedOperations = new HashMap<Peer<O, S>, Integer>();
 
-    private Transformer<O> transformer;
+    private final Transformer<O> transformer;
     
     /**
      * The background task handler which sends out the asynchronous updates to the peers.
      */
-    private ExecutorService merger;
+    private final ExecutorService merger;
 
     public PeerImpl(Transformer<O> transformer, S initialState, Role role) {
 	this.transformer = transformer;
@@ -234,6 +236,7 @@ public class PeerImpl<O extends Operation<S>, S> implements Peer<O, S> {
     }
 
     private void taskScheduled() {
+        logger.fine(""+this+" taskScheduled incrementing scheduleOrRunning from "+scheduledOrRunning+" to "+(scheduledOrRunning+1)); 
 	scheduledOrRunning++;
     }
 
@@ -242,8 +245,10 @@ public class PeerImpl<O extends Operation<S>, S> implements Peer<O, S> {
      * Unblocks {@link #waitForNotRunning()} if the merger's queue got empty by this.
      */
     private synchronized void taskFinished() {
+        logger.fine(""+this+" taskFinished decrementing scheduleOrRunning from "+scheduledOrRunning+" to "+(scheduledOrRunning-1)); 
 	scheduledOrRunning--;
 	if (scheduledOrRunning == 0) {
+	    logger.fine(""+this+" taskFinished notifying waiters"); 
 	    notifyAll();
 	}
     }
@@ -253,6 +258,7 @@ public class PeerImpl<O extends Operation<S>, S> implements Peer<O, S> {
 	while (scheduledOrRunning > 0) {
 	    try {
 		wait();
+		logger.fine(""+this+" waitForNotRunning scheduleOrRunning: "+scheduledOrRunning);
 	    } catch (InterruptedException e) {
 		// ignore interruption, try again
 	    }
diff --git a/java/com.sap.sailing.server.test/src/com/sap/sailing/server/test/OperationalTransformationTest.java b/java/com.sap.sailing.server.test/src/com/sap/sailing/server/test/OperationalTransformationTest.java
index 1bd53516a22..119377844b1 100755
--- a/java/com.sap.sailing.server.test/src/com/sap/sailing/server/test/OperationalTransformationTest.java
+++ b/java/com.sap.sailing.server.test/src/com/sap/sailing/server/test/OperationalTransformationTest.java
@@ -59,14 +59,14 @@ public class OperationalTransformationTest {
     }
 
     @Test
-    public void testAddColumnToLeaderboardOnClientAndRemoveLeaderboardOnServer() {
+    public void testAddColumnToLeaderboardOnClientAndRemoveLeaderboardOnServer() throws InterruptedException {
         RacingEventServiceOperation addLeaderboardColumn = new AddColumnToLeaderboard(
                 "newColumn", DefaultLeaderboardName.DEFAULT_LEADERBOARD_NAME, /* medalRace */ true);
         server.apply(addLeaderboardColumn);
         RacingEventServiceOperation removeDefaultLeaderboard = new RemoveLeaderboard(DefaultLeaderboardName.DEFAULT_LEADERBOARD_NAME);
         replica.apply(removeDefaultLeaderboard);
-        server.waitForNotRunning();
         replica.waitForNotRunning();
+        server.waitForNotRunning();
         assertEquals(0, racingEventServiceReplica.getLeaderboards().size());
         assertEquals(0, racingEventServiceServer.getLeaderboards().size());
     }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardColumnOperation.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardColumnOperation.java
index d92b65d71e7..eedbb080031 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardColumnOperation.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardColumnOperation.java
@@ -20,7 +20,7 @@ public abstract class AbstractLeaderboardColumnOperation extends AbstractLeaderb
 
 
     @Override
-    public RacingEventServiceOperation transformServerRemoveColumnFromLeaderboard(
+    public RacingEventServiceOperation transformRemoveColumnFromLeaderboardServerOp(
             RemoveColumnFromLeaderboard removeColumnFromLeaderboardServerOp) {
         if (affectsSameColumn(removeColumnFromLeaderboardServerOp)) {
             // skip server's remove and hence only apply the client's remove operation
@@ -31,7 +31,7 @@ public abstract class AbstractLeaderboardColumnOperation extends AbstractLeaderb
     }
 
     @Override
-    public RacingEventServiceOperation transformClientRemoveColumnFromLeaderboard(
+    public RacingEventServiceOperation transformRemoveColumnFromLeaderboardClientOp(
             RemoveColumnFromLeaderboard removeColumnFromLeaderboardClientOp) {
         if (affectsSameColumn(removeColumnFromLeaderboardClientOp)) {
             // skip client's remove and hence only apply the server's remove operation
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardOperation.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardOperation.java
index d247a4ce86e..01ab18bdcbb 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardOperation.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractLeaderboardOperation.java
@@ -18,23 +18,4 @@ public abstract class AbstractLeaderboardOperation extends AbstractRacingEventSe
         return getLeaderboardName().equals(other.getLeaderboardName());
     }
 
-    @Override
-    public RacingEventServiceOperation transformRemoveLeaderboardClientOp(RemoveLeaderboard removeLeaderboard) {
-        if (affectsSameLeaderboard(removeLeaderboard)) {
-            return AbstractRacingEventServiceOperation.getNoOp();
-        } else {
-            return this;
-        }
-    }
-
-
-    @Override
-    public RacingEventServiceOperation transformRemoveLeaderboardServerOp(RemoveLeaderboard removeLeaderboard) {
-        if (affectsSameLeaderboard(removeLeaderboard)) {
-            return AbstractRacingEventServiceOperation.getNoOp();
-        } else {
-            return this;
-        }
-    }
-    
 }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractRacingEventServiceOperation.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractRacingEventServiceOperation.java
index a90686cf509..6c5b7cc45e0 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractRacingEventServiceOperation.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AbstractRacingEventServiceOperation.java
@@ -33,27 +33,39 @@ public abstract class AbstractRacingEventServiceOperation implements RacingEvent
     }
 
     @Override
-    public RacingEventServiceOperation transformClientRenameLeaderboardColumnOp(
+    public RacingEventServiceOperation transformRenameLeaderboardColumnClientOp(
             RenameLeaderboardColumn renameLeaderboardColumnClientOp) {
         return renameLeaderboardColumnClientOp;
     }
 
     @Override
-    public RacingEventServiceOperation transformServerRenameLeaderboardColumnOp(
+    public RacingEventServiceOperation transformRenameLeaderboardColumnServerOp(
             RenameLeaderboardColumn renameLeaderboardColumnServerOp) {
         return renameLeaderboardColumnServerOp;
     }
 
     @Override
-    public RacingEventServiceOperation transformServerRemoveColumnFromLeaderboard(RemoveColumnFromLeaderboard removeColumnFromLeaderboardServerOp) {
+    public RacingEventServiceOperation transformRemoveColumnFromLeaderboardServerOp(RemoveColumnFromLeaderboard removeColumnFromLeaderboardServerOp) {
         return removeColumnFromLeaderboardServerOp;
     }
 
     @Override
-    public RacingEventServiceOperation transformClientRemoveColumnFromLeaderboard(RemoveColumnFromLeaderboard removeColumnFromLeaderboardClientOp) {
+    public RacingEventServiceOperation transformRemoveColumnFromLeaderboardClientOp(RemoveColumnFromLeaderboard removeColumnFromLeaderboardClientOp) {
         return removeColumnFromLeaderboardClientOp;
     }
     
+    @Override
+    public RacingEventServiceOperation transformAddColumnToLeaderboardClientOp(
+            AddColumnToLeaderboard addColumnToLeaderboard) {
+        return addColumnToLeaderboard;
+    }
+
+    @Override
+    public RacingEventServiceOperation transformAddColumnToLeaderboardServerOp(
+            AddColumnToLeaderboard addColumnToLeaderboard) {
+        return addColumnToLeaderboard;
+    }
+
     public static RacingEventServiceOperation getNoOp() {
         return new AbstractRacingEventServiceOperation() {
             @Override
@@ -63,12 +75,17 @@ public abstract class AbstractRacingEventServiceOperation implements RacingEvent
 
             @Override
             public RacingEventServiceOperation transformClientOp(RacingEventServiceOperation serverOp) {
-                return serverOp;
+                return this;
             }
 
             @Override
             public RacingEventServiceOperation transformServerOp(RacingEventServiceOperation clientOp) {
-                return clientOp;
+                return this;
+            }
+            
+            @Override
+            public String toString() {
+                return "noop";
             }
         };
     }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AddColumnToLeaderboard.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AddColumnToLeaderboard.java
index b4ca749b45d..ba842dcaa3c 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AddColumnToLeaderboard.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/AddColumnToLeaderboard.java
@@ -25,13 +25,11 @@ public class AddColumnToLeaderboard extends AbstractLeaderboardColumnOperation {
 
     @Override
     public RacingEventServiceOperation transformClientOp(RacingEventServiceOperation serverOp) {
-        // TODO Auto-generated method stub
-        return null;
+        return serverOp.transformAddColumnToLeaderboardClientOp(this);
     }
 
     @Override
     public RacingEventServiceOperation transformServerOp(RacingEventServiceOperation clientOp) {
-        // TODO Auto-generated method stub
-        return null;
+        return clientOp.transformAddColumnToLeaderboardServerOp(this);
     }
 }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RacingEventServiceOperation.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RacingEventServiceOperation.java
index 2594b2a877a..3aaf890613d 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RacingEventServiceOperation.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RacingEventServiceOperation.java
@@ -29,13 +29,13 @@ public interface RacingEventServiceOperation extends Operation<RacingEventServic
      * operation deals with the leaderboard column being removed by <code>removeColumnFromLeaderboardClientOp</code>,
      * the result will be <code>null</code>, meaning that this operation cannot be applied after the column has been removed.
      */
-    RacingEventServiceOperation transformClientRemoveColumnFromLeaderboard(RemoveColumnFromLeaderboard removeColumnFromLeaderboardClientOp);
+    RacingEventServiceOperation transformRemoveColumnFromLeaderboardClientOp(RemoveColumnFromLeaderboard removeColumnFromLeaderboardClientOp);
 
-    RacingEventServiceOperation transformServerRemoveColumnFromLeaderboard(RemoveColumnFromLeaderboard removeColumnFromLeaderboardServerOp);
+    RacingEventServiceOperation transformRemoveColumnFromLeaderboardServerOp(RemoveColumnFromLeaderboard removeColumnFromLeaderboardServerOp);
 
-    RacingEventServiceOperation transformClientRenameLeaderboardColumnOp(RenameLeaderboardColumn renameLeaderboardColumnClientOp);
+    RacingEventServiceOperation transformRenameLeaderboardColumnClientOp(RenameLeaderboardColumn renameLeaderboardColumnClientOp);
 
-    RacingEventServiceOperation transformServerRenameLeaderboardColumnOp(RenameLeaderboardColumn renameLeaderboardColumnServerOp);
+    RacingEventServiceOperation transformRenameLeaderboardColumnServerOp(RenameLeaderboardColumn renameLeaderboardColumnServerOp);
 
     RacingEventServiceOperation transformAddLeaderboardClientOp(AddLeaderboard addLeaderboard);
 
@@ -44,4 +44,8 @@ public interface RacingEventServiceOperation extends Operation<RacingEventServic
     RacingEventServiceOperation transformRemoveLeaderboardClientOp(RemoveLeaderboard removeLeaderboard);
 
     RacingEventServiceOperation transformRemoveLeaderboardServerOp(RemoveLeaderboard removeLeaderboard);
+
+    RacingEventServiceOperation transformAddColumnToLeaderboardClientOp(AddColumnToLeaderboard addColumnToLeaderboard);
+
+    RacingEventServiceOperation transformAddColumnToLeaderboardServerOp(AddColumnToLeaderboard addColumnToLeaderboard);
 }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveColumnFromLeaderboard.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveColumnFromLeaderboard.java
index f50b76440f7..475b240e793 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveColumnFromLeaderboard.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveColumnFromLeaderboard.java
@@ -17,12 +17,12 @@ public class RemoveColumnFromLeaderboard extends AbstractLeaderboardColumnOperat
 
     @Override
     public RacingEventServiceOperation transformClientOp(RacingEventServiceOperation serverOp) {
-        return serverOp.transformClientRemoveColumnFromLeaderboard(this);
+        return serverOp.transformRemoveColumnFromLeaderboardClientOp(this);
     }
 
     @Override
     public RacingEventServiceOperation transformServerOp(RacingEventServiceOperation clientOp) {
-        return clientOp.transformServerRemoveColumnFromLeaderboard(this);
+        return clientOp.transformRemoveColumnFromLeaderboardServerOp(this);
     }
 
 }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveLeaderboard.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveLeaderboard.java
index d7d28d1a921..8c46526c014 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveLeaderboard.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RemoveLeaderboard.java
@@ -23,4 +23,59 @@ public class RemoveLeaderboard extends AbstractLeaderboardOperation {
         return toState;
     }
 
+    @Override
+    public RacingEventServiceOperation transformRenameLeaderboardColumnClientOp(
+            RenameLeaderboardColumn renameLeaderboardColumnClientOp) {
+        return AbstractRacingEventServiceOperation.getNoOp();
+    }
+
+    @Override
+    public RacingEventServiceOperation transformRenameLeaderboardColumnServerOp(
+            RenameLeaderboardColumn renameLeaderboardColumnServerOp) {
+        return AbstractRacingEventServiceOperation.getNoOp();
+    }
+
+    @Override
+    public RacingEventServiceOperation transformRemoveColumnFromLeaderboardServerOp(
+            RemoveColumnFromLeaderboard removeColumnFromLeaderboardServerOp) {
+        return AbstractRacingEventServiceOperation.getNoOp();
+    }
+
+    @Override
+    public RacingEventServiceOperation transformRemoveColumnFromLeaderboardClientOp(
+            RemoveColumnFromLeaderboard removeColumnFromLeaderboardClientOp) {
+        return AbstractRacingEventServiceOperation.getNoOp();
+    }
+
+    @Override
+    public RacingEventServiceOperation transformAddColumnToLeaderboardClientOp(
+            AddColumnToLeaderboard addColumnToLeaderboard) {
+        return AbstractRacingEventServiceOperation.getNoOp();
+    }
+
+    @Override
+    public RacingEventServiceOperation transformAddColumnToLeaderboardServerOp(
+            AddColumnToLeaderboard addColumnToLeaderboard) {
+        return AbstractRacingEventServiceOperation.getNoOp();
+    }
+
+    @Override
+    public RacingEventServiceOperation transformRemoveLeaderboardClientOp(RemoveLeaderboard removeLeaderboard) {
+        if (affectsSameLeaderboard(removeLeaderboard)) {
+            return AbstractRacingEventServiceOperation.getNoOp();
+        } else {
+            return this;
+        }
+    }
+
+
+    @Override
+    public RacingEventServiceOperation transformRemoveLeaderboardServerOp(RemoveLeaderboard removeLeaderboard) {
+        if (affectsSameLeaderboard(removeLeaderboard)) {
+            return AbstractRacingEventServiceOperation.getNoOp();
+        } else {
+            return this;
+        }
+    }
+    
 }
diff --git a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RenameLeaderboardColumn.java b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RenameLeaderboardColumn.java
index 62b474937c5..c876aff1b1b 100755
--- a/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RenameLeaderboardColumn.java
+++ b/java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/RenameLeaderboardColumn.java
@@ -19,13 +19,13 @@ public class RenameLeaderboardColumn extends AbstractLeaderboardColumnOperation
 
     @Override
     public RacingEventServiceOperation transformClientOp(RacingEventServiceOperation serverOp) {
-        return serverOp.transformClientRenameLeaderboardColumnOp(this);
+        return serverOp.transformRenameLeaderboardColumnClientOp(this);
     }
 
 
     @Override
     public RacingEventServiceOperation transformServerOp(RacingEventServiceOperation clientOp) {
-        return clientOp.transformServerRenameLeaderboardColumnOp(this);
+        return clientOp.transformRenameLeaderboardColumnServerOp(this);
     }
 
 }