Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java	(revision 4140)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java	(revision 4141)
@@ -433,5 +433,7 @@
         if (itemToSelect != null) {
             keys.setSelectedItem(itemToSelect);
-            values.setSelectedItem(lastAddValue);
+            /* don't add single chars, as they are no properly selected */
+            if(lastAddValue != null && lastAddValue.length() > 1)
+                values.setSelectedItem(lastAddValue);
         }