diff --git a/src/de/mpg/molgen/buczek/portifix/Gui.java b/src/de/mpg/molgen/buczek/portifix/Gui.java
index 5d52388..b4e2efd 100644
--- a/src/de/mpg/molgen/buczek/portifix/Gui.java
+++ b/src/de/mpg/molgen/buczek/portifix/Gui.java
@@ -21,7 +21,6 @@
 import java.sql.SQLException;
 import java.text.ParseException;
 import java.util.Date;
-import java.util.Properties;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javax.swing.AbstractAction;
@@ -71,11 +70,11 @@ private String[] columnValuesOfSelection(int col) {
         int selected[] = jTable1.getSelectedRows();
         String[] ret = new String[selected.length];
         for (int i = 0; i < selected.length; i++) {
-            Object o=tableModel.getValueAt(jTable1.convertRowIndexToModel(selected[i]), col);
-            if (o==null) {
+            Object o = tableModel.getValueAt(jTable1.convertRowIndexToModel(selected[i]), col);
+            if (o == null) {
                 ret[i] = "";
             } else {
-                ret[i]=o.toString();
+                ret[i] = o.toString();
             }
         }
         return ret;
@@ -108,15 +107,16 @@ private static void setTreeEnabled(Component component, boolean enabled) {
 
     /**
      * no String.join() in Java 1.7
+     *
      * @param delim
      * @param s1
      * @param s2
-     * @return 
+     * @return
      */
-    private String join(String delim,String s1,String s2) {
-        if (s1!=null && s1.length()>0) {
-            if (s2!=null && s2.length()>0) {
-                return s1+delim+s2;
+    private String join(String delim, String s1, String s2) {
+        if (s1 != null && s1.length() > 0) {
+            if (s2 != null && s2.length() > 0) {
+                return s1 + delim + s2;
             } else {
                 return s1;
             }
@@ -125,38 +125,45 @@ private String join(String delim,String s1,String s2) {
         }
     }
 
+    private void setEditEnabled(boolean enabled) {
+        textField_datum.setEnabled(enabled);
+        textField_endedatum.setEnabled(enabled);
+    }
+
     private void updateForm() {
 
         int selected[] = jTable1.getSelectedRows();
+        for (int i = 0; i < selected.length; i++) {
+            selected[i] = jTable1.convertRowIndexToModel(selected[i]);
+        }
+
         if (selected.length == 0) {
-            textField_datum.setEnabled(false);
+            setEditEnabled(false);
         } else {
             String[] name = new String[selected.length];
             String[] exemplar = new String[selected.length];
             for (int i = 0; i < name.length; i++) {
-                int mi = jTable1.convertRowIndexToModel(selected[i]);
-                name[i]=join(" ",(String)tableModel.getValueAt(mi,TableModel.COLUMN_VORNAME),(String)tableModel.getValueAt(mi,TableModel.COLUMN_NACHNAME));
-                exemplar[i]=join (" # ",(String)tableModel.getValueAt(mi,TableModel.COLUMN_SCHLUESSELNUMMER),(String)tableModel.getValueAt(mi,TableModel.COLUMN_EXEMPLARNUMMER));
+                name[i] = join(" ", (String) tableModel.getValueAt(i, TableModel.COLUMN_VORNAME), (String) tableModel.getValueAt(i, TableModel.COLUMN_NACHNAME));
+                exemplar[i] = join(" # ", (String) tableModel.getValueAt(i, TableModel.COLUMN_SCHLUESSELNUMMER), (String) tableModel.getValueAt(i, TableModel.COLUMN_EXEMPLARNUMMER));
             }
 
             label_name.setText(singleColumnValueOfArray(name));
             label_abteilung.setText(singleColumnValueOfSelection(TableModel.COLUMN_ABTEILUNG));
             label_schluessel.setText(singleColumnValueOfArray(exemplar));
             textField_datum.setText(singleColumnValueOfSelection(TableModel.COLUMN_RUECKGABEDATUM));
-            textField_datum.setEnabled(true);
             textField_endedatum.setText(singleColumnValueOfSelection(TableModel.COLUMN_ENDEDATUM));
-            textField_endedatum.setEnabled(true);
 
+            setEditEnabled(isUnique(columnValuesOfSelection(TableModel.COLUMN_PERSONAL_ID)));
         }
     }
 
-    private final int EDIT_MODE_PERSON=1;
-    private final int EDIT_MODE_EXEMPLAR=2;
-    
+    private final int EDIT_MODE_PERSON = 1;
+    private final int EDIT_MODE_EXEMPLAR = 2;
+
     private int edit_mode;
-    
+
     private void startEdit(int edit_mode) {
-        this.edit_mode=edit_mode;
+        this.edit_mode = edit_mode;
         jTable1.setEnabled(false);
         // setTreeEnabled(jTable1, false);
         button_refresh.setEnabled(false);
@@ -202,7 +209,7 @@ private void saveThis() {
             }
 
         } else {
-               throw new Error("internal error");
+            throw new Error("internal error");
         }
     }
 
@@ -226,7 +233,6 @@ public void run() {
         textField_datum.setEnabled(false);
         textField_endedatum.setEnabled(false);
 
-        
         jTable1.addMouseListener(popupListener);
 
         jTable1.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
@@ -259,12 +265,12 @@ public void focusGained(FocusEvent e) {
                 }
                 startEdit(EDIT_MODE_EXEMPLAR);
             }
+
             @Override
             public void focusLost(FocusEvent e) {
             }
         });
 
-        
         textField_endedatum.addFocusListener(new FocusListener() {
 
             @Override
@@ -279,8 +285,7 @@ public void focusGained(FocusEvent e) {
             public void focusLost(FocusEvent e) {
             }
         });
-        
-        
+
         button_cancel.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
@@ -301,7 +306,7 @@ public void actionPerformed(ActionEvent e) {
                 filltable();
             }
         });
-        
+
         getRootPane().setDefaultButton(button_ok);
 
         // Action copy=jTable1.getActionMap().get("copy");
@@ -314,8 +319,6 @@ public void actionPerformed(ActionEvent e) {
             }
         });
 
-        
-        
         updateForm();
     }