diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
index 0ee72bb..d7ead39 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
@@ -129,7 +129,7 @@ public class FtrDbLoader implements IWaveformDbLoader {
 	 * Gets the transaction.
 	 *
 	 * @param txId the tx id
-	 * @return the transaction
+	 * @return the transaction or null if the transaction is not available
 	 */
 	public synchronized ITx getTransaction(long txId) {
 		if (txCache.containsKey(txId))
@@ -139,7 +139,7 @@ public class FtrDbLoader implements IWaveformDbLoader {
 			txCache.put(txId, tx);
 			return tx;
 		} else {
-			throw new IllegalArgumentException();
+			return null;
 		}
 	}
 
@@ -528,12 +528,14 @@ public class FtrDbLoader implements IWaveformDbLoader {
 		CborType next = cborDecoder.peekType();
 		while(next != null && !break_type.isEqualType(next)) {
 			long sz = cborDecoder.readArrayLength();
-			assert(sz==3);
+			assert(sz==5);
 			long type_id = cborDecoder.readInt();
 			long from_id = cborDecoder.readInt();
 			long to_id = cborDecoder.readInt();
+			long from_fiber = sz>3?cborDecoder.readInt():-1;
+			long to_fiber = sz>3?cborDecoder.readInt():-1;
 			String rel_name = strDict.get((int)type_id);
-			FtrRelation ftrRel = new FtrRelation(relationTypes.getOrDefault(rel_name, RelationTypeFactory.create(rel_name)), from_id, to_id);
+			FtrRelation ftrRel = new FtrRelation(relationTypes.getOrDefault(rel_name, RelationTypeFactory.create(rel_name)), from_id, to_id, from_fiber, to_fiber);
 			relationsOut.put(from_id, ftrRel);
 			relationsIn.put(to_id, ftrRel);
 			next = cborDecoder.peekType();
diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxRelation.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxRelation.java
index 0f1e8ba..6a4c158 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxRelation.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxRelation.java
@@ -10,8 +10,14 @@
  *******************************************************************************/
 package com.minres.scviewer.database.ftr;
 
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.RelationType;
 import com.minres.scviewer.database.tx.ITx;
+import com.minres.scviewer.database.tx.ITxAttribute;
 import com.minres.scviewer.database.tx.ITxRelation;
 
 /**
@@ -53,7 +59,9 @@ class TxRelation implements ITxRelation {
 	 */
 	@Override
 	public ITx getSource() {
-		return loader.getTransaction(scvRelation.source);
+		ITx tx = loader.getTransaction(scvRelation.source);
+		if(tx!=null) return tx;
+		return new TxFacade(scvRelation.source_fiber, scvRelation.source);
 	}
 
 	/**
@@ -63,7 +71,82 @@ class TxRelation implements ITxRelation {
 	 */
 	@Override
 	public ITx getTarget() {
-		return loader.getTransaction(scvRelation.target);
+		ITx tx = loader.getTransaction(scvRelation.target);
+		if(tx!=null) return tx;
+		return new TxFacade(scvRelation.target_fiber, scvRelation.target);
 	}
 
+	private class TxFacade implements ITx {
+
+		final long fiberId;
+		
+		final long txId;
+		
+		ITx tx = null;
+		
+		public TxFacade(long fiberId, long txId) {
+			this.fiberId = fiberId;
+			this.txId=txId;
+		}
+
+		@Override
+		public int compareTo(ITx o) {
+			return tx==null?-1:tx.compareTo(o);
+		}
+
+		@Override
+		public long getId() {
+			return txId;
+		}
+
+		@Override
+		public IWaveform getStream() {
+			if(tx==null) {
+				TxStream fiber = loader.txStreams.get(fiberId);
+				fiber.loadStream();
+				tx = loader.getTransaction(txId);
+				return loader.txStreams.get(fiberId);
+			} else
+				return tx.getStream();
+		}
+
+		@Override
+		public IWaveform getGenerator() {
+			if(tx==null) {
+				loader.txStreams.get(fiberId).loadStream();
+				tx = loader.getTransaction(txId);
+			}
+			return tx.getGenerator();
+		}
+
+		@Override
+		public long getBeginTime() {
+			return tx==null?-1:tx.getBeginTime();
+		}
+
+		@Override
+		public long getEndTime() {
+			return tx==null?-1:tx.getBeginTime();
+		}
+
+		@Override
+		public List<ITxAttribute> getAttributes() {
+			return tx==null?new ArrayList<>():tx.getAttributes();
+		}
+
+		@Override
+		public Collection<ITxRelation> getIncomingRelations() {
+			return tx==null?new ArrayList<>():tx.getIncomingRelations();
+		}
+
+		@Override
+		public Collection<ITxRelation> getOutgoingRelations() {
+			return tx==null?new ArrayList<>():tx.getOutgoingRelations();
+		}
+
+		@Override
+		public String toString() {
+			return tx==null?("tx#" + getId() + "[not available]"):tx.toString();
+		}
+	}
 }
diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxStream.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxStream.java
index bb356c3..5c95e5b 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxStream.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxStream.java
@@ -71,6 +71,18 @@ class TxStream extends AbstractTxStream {
 		return chunks;
 	}
 
+	public void loadStream() {
+		try {
+			List<byte[]> chunks = getChunks();
+			int blockid = 0;
+			for (byte[] bs : chunks) {
+				loader.parseTx(this, blockid, bs);
+				blockid++;
+			}
+		} catch (InputFormatException e) {
+		} catch (IOException e) {
+		}
+	}
 	/**
 	 * Gets the events.
 	 *
@@ -79,17 +91,9 @@ class TxStream extends AbstractTxStream {
 	@Override
 	public IEventList getEvents() {
 		if(events.size()==0) {
-			try {
-				List<byte[]> chunks = getChunks();
-				int blockid = 0;
-				for (byte[] bs : chunks) {
-					loader.parseTx(this, blockid, bs);
-					blockid++;
-				}
-			} catch (InputFormatException e) {
-			} catch (IOException e) {
-			}
+			loadStream();
 		}
 		return events;
 	}
+
 }