diff --git a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/annotation/view/fx/AnnotationViewFXController.java b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/annotation/view/fx/AnnotationViewFXController.java
index 3acca7e9fc439cdc5d1fe5ec81a68d7867778d3e..b1b158dfa745f7bdb368dacd9f73eaa21d2a71df 100644
--- a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/annotation/view/fx/AnnotationViewFXController.java
+++ b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/annotation/view/fx/AnnotationViewFXController.java
@@ -86,6 +86,12 @@ public class AnnotationViewFXController extends CompositeFXControllerBase<SplitP
 	/** Option text for the annotation type filter combo box. */
 	private static final String SHOW_ALL_ANNOTATION_TYPES = "Show all annotation types";
 
+	/**
+	 * Root element to be added to the tree viewer (but not displayed). Container for all
+	 * {@link AnnotationEntry}s.
+	 */
+	ArtificialRoot root = new ArtificialRoot();
+
 	/** {@link TextField} for entering the filter pattern. */
 	@FXML
 	private TextField txtFilterText;
@@ -227,16 +233,16 @@ public class AnnotationViewFXController extends CompositeFXControllerBase<SplitP
 			listElements.add((IModelElement)curentRootElement);
 		}
 
-		ArtificialRoot rootElement = new ArtificialRoot();
+		root = new ArtificialRoot();
 
 		for(IModelElement elem : listElements) {
 			AnnotationEntry entry = IAnnotationValueService.getInstance().getAnnotationEntry(elem);
 
 			if(entry != null && !entry.getSpecificationsList().isEmpty()) {
-				rootElement.elements.add(entry);
+				root.elements.add(entry);
 			}
 		}
-		sort(rootElement.elements);
+		sort(root.elements);
 
 		Set<AnnotationEntry> annotationEntries = new HashSet<>();
 		listElements.forEach(e -> annotationEntries
@@ -260,7 +266,7 @@ public class AnnotationViewFXController extends CompositeFXControllerBase<SplitP
 				new AnnotationTreeTableUIProvider();
 
 		annotationViewer = new DynamicTreeTableViewer<AnnotationEntry>(annotationTreeTableView,
-				rootElement, showRoot, revealLevel, filterContentProvider, uiProvider);
+				root, showRoot, revealLevel, filterContentProvider, uiProvider);
 
 		annotationViewer.addColumn("Model Element", 200);
 		annotationViewer.addColumn("Comment", 250);
@@ -542,6 +548,25 @@ public class AnnotationViewFXController extends CompositeFXControllerBase<SplitP
 
 			return false;
 		}
+
+		/** {@inheritDoc} */
+		@Override
+		public boolean isEditable(int column) {
+
+			// The first two columns are not supposed to be editable.
+			if(column <= 1) {
+				return false;
+			}
+
+			for(AnnotationEntry ae : root.elements) {
+				// If any cell is editable in this column, the column is editable.
+				if(isEditable(column, ae)) {
+					return true;
+				}
+			}
+
+			return false;
+		}
 	}
 
 	/**
diff --git a/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/.ratings b/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/.ratings
index a973120c509887bc315615f805e9b767f84205cf..121a6f1dc733cc39a2096a5b6cdb78eb3120cf08 100644
--- a/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/.ratings
+++ b/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/.ratings
@@ -1,4 +1,4 @@
-ErrorViewFXLayoutController.java 382b8014acf4b0c625817d6279dfcdd670296cb2 GREEN
+ErrorViewFXLayoutController.java 5549b928801393c169983c116c5a23aa19b3e291 YELLOW
 ErrorViewFXViewPart.java f620022aef647d7a019be8afc5351fabde05dcee GREEN
 MarkerViewFXContentProvider.java ecf92449414b2b8648ad151bc932189baa23dc12 GREEN
 MarkerViewFXUIProvider.java c5719d95ac7bd5605fff65d6150eca8b9ca6fc02 GREEN
diff --git a/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/ErrorViewFXLayoutController.java b/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/ErrorViewFXLayoutController.java
index 382b8014acf4b0c625817d6279dfcdd670296cb2..5549b928801393c169983c116c5a23aa19b3e291 100644
--- a/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/ErrorViewFXLayoutController.java
+++ b/org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/views/fx/ErrorViewFXLayoutController.java
@@ -117,7 +117,9 @@ public class ErrorViewFXLayoutController extends CompositeFXControllerBase<Node,
 
 	/** Refreshes the tree table. */
 	public void refresh() {
-		treeTable.update();
+		if(treeTable != null) {
+			treeTable.update();
+		}
 	}
 
 	/** {@inheritDoc} */