diff --git a/src/de/katho/kBorrow/controller/UserController.java b/src/de/katho/kBorrow/controller/UserController.java
index d8250f9..824872d 100644
--- a/src/de/katho/kBorrow/controller/UserController.java
+++ b/src/de/katho/kBorrow/controller/UserController.java
@@ -1,8 +1,11 @@
 package de.katho.kBorrow.controller;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 
+import de.katho.kBorrow.data.KLending;
 import de.katho.kBorrow.db.DbConnector;
+import de.katho.kBorrow.models.LendingTableModel;
 import de.katho.kBorrow.models.UserTableModel;
 import de.katho.kBorrow.models.UserListModel;
 
@@ -11,11 +14,13 @@ public class UserController {
 	private DbConnector dbCon;
 	private UserTableModel userTableModel;
 	private UserListModel userListModel;
+	private LendingTableModel lendingTableModel;
 	
 	public UserController(DbConnector pDbCon, HashMap<String, Object> pModels) {
 		dbCon = pDbCon;
 		userTableModel = (UserTableModel)pModels.get("usertablemodel");
 		userListModel = (UserListModel)pModels.get("userlistmodel");
+		lendingTableModel = (LendingTableModel)pModels.get("lendingtablemodel");
 	}
 
 	public int createUser(String pName, String pSurname){
@@ -41,13 +46,28 @@ public class UserController {
 	public boolean deleteUser(int pRow){
 		int id = userTableModel.getUserByRow(pRow).getId();
 		
-		if(dbCon.deleteUser(id)){
-			userTableModel.updateModel();
-			userListModel.updateModel();
-			
-			return true;
+		boolean isOccupied = false;
+		ArrayList<KLending> lendingList = lendingTableModel.getLendingList();
+		for(KLending elem : lendingList){
+			if(elem.getUserId() == id){
+				isOccupied = true;
+				break;
+			}
+		}
+		
+		if(isOccupied){
+			//select und rewrite
+			return deleteUser(pRow);
+		}
+		else {
+			if(dbCon.deleteUser(id)){
+				userTableModel.updateModel();
+				userListModel.updateModel();
+			
+				return true;
+			}
+			return false;
 		}
-		return false;
 	}
 
 }
diff --git a/src/de/katho/kBorrow/gui/RewriteToNewUserDialog.java b/src/de/katho/kBorrow/gui/RewriteToNewUserDialog.java
new file mode 100644
index 0000000..77c85aa
--- /dev/null
+++ b/src/de/katho/kBorrow/gui/RewriteToNewUserDialog.java
@@ -0,0 +1,48 @@
+package de.katho.kBorrow.gui;
+
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+
+import javax.swing.JButton;
+import javax.swing.JDialog;
+import javax.swing.JPanel;
+import javax.swing.border.EmptyBorder;
+
+public class RewriteToNewUserDialog extends JDialog {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = -6002073589194176368L;
+	private final JPanel contentPanel = new JPanel();
+
+	/**
+	 * Create the dialog.
+	 */
+	public RewriteToNewUserDialog() {
+		setBounds(100, 100, 450, 300);
+		setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
+		getContentPane().setLayout(new BorderLayout());
+		setVisible(true);
+		contentPanel.setLayout(new FlowLayout());
+		contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
+		getContentPane().add(contentPanel, BorderLayout.CENTER);
+		{
+			JPanel buttonPane = new JPanel();
+			buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
+			getContentPane().add(buttonPane, BorderLayout.SOUTH);
+			{
+				JButton okButton = new JButton("OK");
+				okButton.setActionCommand("OK");
+				buttonPane.add(okButton);
+				getRootPane().setDefaultButton(okButton);
+			}
+			{
+				JButton cancelButton = new JButton("Cancel");
+				cancelButton.setActionCommand("Cancel");
+				buttonPane.add(cancelButton);
+			}
+		}
+	}
+
+}
diff --git a/src/de/katho/kBorrow/models/LendingTableModel.java b/src/de/katho/kBorrow/models/LendingTableModel.java
index 1ce4101..da80c44 100644
--- a/src/de/katho/kBorrow/models/LendingTableModel.java
+++ b/src/de/katho/kBorrow/models/LendingTableModel.java
@@ -79,11 +79,10 @@ public class LendingTableModel extends AbstractTableModel {
 		}
 	}
 	
-	// Die Funktion muss differenzierter werden
-		public boolean isCellEditable(int row, int col){
-			if (col > 4) return true;
-			return false;
-		}
+	public boolean isCellEditable(int row, int col){
+		if (col > 4) return true;
+		return false;
+	}
 	
 	public void updateModel(){
 		data = dbCon.getActiveLendingList();
@@ -100,5 +99,9 @@ public class LendingTableModel extends AbstractTableModel {
 		}
 		return null;
 	}
+	
+	public ArrayList<KLending> getLendingList(){
+		return data;
+	}
 
 }