diff --git a/hsarweb/src/de/hsadmin/web/EMailAliasModule.java b/hsarweb/src/de/hsadmin/web/EMailAliasModule.java
index a7f14f9..c2708eb 100644
--- a/hsarweb/src/de/hsadmin/web/EMailAliasModule.java
+++ b/hsarweb/src/de/hsadmin/web/EMailAliasModule.java
@@ -1,9 +1,17 @@
 package de.hsadmin.web;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+
 import de.hsadmin.web.config.ModuleConfig;
 import de.hsadmin.web.config.PropertyConfig;
 import de.hsadmin.web.config.PropertyDefaultValue;
+import de.hsadmin.web.config.PropertySelectValues;
 import de.hsadmin.web.config.PropertyTableColumn;
+import de.hsadmin.web.vaadin.SelectPropertyFieldFactory;
 
 public class EMailAliasModule extends GenericModule {
 
@@ -39,18 +47,37 @@ public class EMailAliasModule extends GenericModule {
 				return "";
 			}
 		});
-		PropertyConfig pacProp = new PropertyConfig(moduleConfig, "pac", String.class, PropertyTableColumn.HIDDEN);
+		PropertyConfig pacProp = new PropertyConfig(moduleConfig, "pac", String.class, PropertyTableColumn.HIDDEN, new SelectPropertyFieldFactory());
 		pacProp.setDefaultValue(new PropertyDefaultValue() {
 			@Override
 			public String getDefaultValue() {
 				return pac;
 			}
 		});
-		pacProp.setReadOnly(true);
+		pacProp.setSelectValues(new PropertySelectValues() {
+			@Override
+			public boolean newItemsAllowed() {
+				return false;
+			}
+			@Override
+			public boolean hasSelectList() {
+				return true;
+			}
+			@Override
+			public Map<String, String> getSelectValues() {
+				List<String> list = getPackets();
+				TreeMap<String,String> map = new TreeMap<String, String>();
+				for (String pac : list) {
+					map.put(pac, pac);
+				}
+				return map;
+			}
+		});
+		pacProp.setWriteOnce(true);
 		moduleConfig.addProperty(idProp);
+		moduleConfig.addProperty(pacProp);
 		moduleConfig.addProperty(nameProp);
 		moduleConfig.addProperty(targetProp);
-		moduleConfig.addProperty(pacProp);
 	}
 	
 	@Override
@@ -58,4 +85,25 @@ public class EMailAliasModule extends GenericModule {
 		return moduleConfig;
 	}
 
+	public List<String> getPackets() {
+		ArrayList<String> list = new ArrayList<String>();
+		try {
+			Object callSearch = getApplication().getRemote().callSearch("pac", new HashMap<String, String>());
+			if (callSearch instanceof Object[]) {
+				for (Object row : ((Object[])callSearch)) {
+					if (row instanceof Map<?, ?>) {
+						Object object = ((Map<?, ?>) row).get("name");
+						if (object instanceof String) {
+							list.add((String) object);
+						}
+					}
+				}
+			}
+		} catch (HsarwebException e) {
+			e.printStackTrace();
+			getApplication().showSystemException(e);
+		}
+		return list;
+	}
+
 }
diff --git a/hsarweb/src/de/hsadmin/web/UnixUserModule.java b/hsarweb/src/de/hsadmin/web/UnixUserModule.java
index f7f1d98..294bc0b 100644
--- a/hsarweb/src/de/hsadmin/web/UnixUserModule.java
+++ b/hsarweb/src/de/hsadmin/web/UnixUserModule.java
@@ -1,5 +1,8 @@
 package de.hsadmin.web;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 
@@ -22,6 +25,33 @@ public class UnixUserModule extends GenericModule {
 		moduleConfig = new ModuleConfig("user");
 		String login = getApplication().getLogin();
 		final String pac = login.length() >= 5 ? login.substring(0, 5) : "";
+		PropertyConfig pacProp = new PropertyConfig(moduleConfig, "pac", String.class, PropertyTableColumn.HIDDEN, new SelectPropertyFieldFactory());
+		pacProp.setSelectValues(new PropertySelectValues() {
+			@Override
+			public boolean newItemsAllowed() {
+				return false;
+			}
+			@Override
+			public boolean hasSelectList() {
+				return true;
+			}
+			@Override
+			public Map<String, String> getSelectValues() {
+				List<String> list = getPackets();
+				TreeMap<String,String> map = new TreeMap<String, String>();
+				for (String pac : list) {
+					map.put(pac, pac);
+				}
+				return map;
+			}
+		});
+		pacProp.setDefaultValue(new PropertyDefaultValue() {
+			@Override
+			public String getDefaultValue() {
+				return pac;
+			}
+		});
+		pacProp.setWriteOnce(true);
 		PropertyConfig idProp = new PropertyConfig(moduleConfig, "id", Long.class, PropertyTableColumn.INTERNAL_KEY);
 		idProp.setReadOnly(true);
 		PropertyConfig useridProp = new PropertyConfig(moduleConfig, "userid", Long.class, PropertyTableColumn.HIDDEN);
@@ -71,14 +101,6 @@ public class UnixUserModule extends GenericModule {
 		});
 		PropertyConfig homedirProp = new PropertyConfig(moduleConfig, "homedir", String.class, PropertyTableColumn.HIDDEN);
 		homedirProp.setReadOnly(true);
-		PropertyConfig pacProp = new PropertyConfig(moduleConfig, "pac", String.class, PropertyTableColumn.HIDDEN);
-		pacProp.setReadOnly(true);
-		pacProp.setDefaultValue(new PropertyDefaultValue() {
-			@Override
-			public String getDefaultValue() {
-				return pac;
-			}
-		});
 		PropertyConfig softQuotaProp = new PropertyConfig(moduleConfig, "quota_softlimit", Long.class, PropertyTableColumn.HIDDEN);
 		softQuotaProp.setDefaultValue(new PropertyDefaultValue() {
 			@Override
@@ -93,6 +115,7 @@ public class UnixUserModule extends GenericModule {
 				return "0";
 			}
 		});
+		moduleConfig.addProperty(pacProp);
 		moduleConfig.addProperty(idProp);
 		moduleConfig.addProperty(useridProp);
 		moduleConfig.addProperty(nameProp);
@@ -100,7 +123,6 @@ public class UnixUserModule extends GenericModule {
 		moduleConfig.addProperty(commentProp);
 		moduleConfig.addProperty(shellProp);
 		moduleConfig.addProperty(homedirProp);
-		moduleConfig.addProperty(pacProp);
 		moduleConfig.addProperty(softQuotaProp);
 		moduleConfig.addProperty(hardQuotaProp);
 	}
@@ -110,4 +132,25 @@ public class UnixUserModule extends GenericModule {
 		return moduleConfig;
 	}
 
+	public List<String> getPackets() {
+		ArrayList<String> list = new ArrayList<String>();
+		try {
+			Object callSearch = getApplication().getRemote().callSearch("pac", new HashMap<String, String>());
+			if (callSearch instanceof Object[]) {
+				for (Object row : ((Object[])callSearch)) {
+					if (row instanceof Map<?, ?>) {
+						Object object = ((Map<?, ?>) row).get("name");
+						if (object instanceof String) {
+							list.add((String) object);
+						}
+					}
+				}
+			}
+		} catch (HsarwebException e) {
+			e.printStackTrace();
+			getApplication().showSystemException(e);
+		}
+		return list;
+	}
+
 }
diff --git a/hsarweb/src/de/hsadmin/web/vaadin/GenericForm.java b/hsarweb/src/de/hsadmin/web/vaadin/GenericForm.java
index be0c8ea..cec667a 100644
--- a/hsarweb/src/de/hsadmin/web/vaadin/GenericForm.java
+++ b/hsarweb/src/de/hsadmin/web/vaadin/GenericForm.java
@@ -56,13 +56,15 @@ public class GenericForm {
 				f.setData(entityId);
 				Layout layout = f.getLayout();
 				for (PropertyConfig prop : config.getPropertyList()) {
-					PropertyFieldFactory propFieldFactory = prop.getPropFieldFactory();
-					Object value = row.get(prop.getId());
-					Component component = (Component) propFieldFactory.createFieldComponent(prop, value);
-					if (propFieldFactory.isWriteOnce()) {
-						component.setReadOnly(true);
+					if (!prop.getPropTableColumn().equals(PropertyTableColumn.INTERNAL_KEY)) {
+						PropertyFieldFactory propFieldFactory = prop.getPropFieldFactory();
+						Object value = row.get(prop.getId());
+						Component component = (Component) propFieldFactory.createFieldComponent(prop, value);
+						if (propFieldFactory.isWriteOnce()) {
+							component.setReadOnly(true);
+						}
+						layout.addComponent(component);
 					}
-					layout.addComponent(component);
 				}
 				return f;
 			}