diff --git a/hsarback/src/de/hsadmin/mods/db/Database.java b/hsarback/src/de/hsadmin/mods/db/Database.java
index 74161e7..9ffb6c6 100644
--- a/hsarback/src/de/hsadmin/mods/db/Database.java
+++ b/hsarback/src/de/hsadmin/mods/db/Database.java
@@ -44,7 +44,7 @@ public abstract class Database extends AbstractEntity implements Serializable {
 	@Column(name = "database_id", columnDefinition = "integer", updatable=false, insertable=false)
 	private long id;
 
-	@AnnFieldIO(validation="[a-zA-Z]*", rw=ReadWriteAccess.WRITEONCE)
+	@AnnFieldIO(validation="[a-zA-Z]*", rw=ReadWriteAccess.READONLY)
 	@Column(name = "engine", columnDefinition = "character varying(12)", updatable=false)
 	private String instance;
 
@@ -58,7 +58,7 @@ public abstract class Database extends AbstractEntity implements Serializable {
 
 	@JoinColumn(name = "packet_id", columnDefinition = "integer", updatable=false)
 	@ManyToOne(fetch = EAGER)
-	@AnnFieldIO(validation="[a-z0-9]*", rw=ReadWriteAccess.WRITEONCE)
+	@AnnFieldIO(validation="[a-z0-9]*", rw=ReadWriteAccess.READONLY)
 	private Pac pac;
 
 	@AnnFieldIO(validation="[A-Za-z0-9\\_\\-]*", rw=ReadWriteAccess.WRITEONCE)
diff --git a/hsarback/src/de/hsadmin/mods/db/DatabaseUser.java b/hsarback/src/de/hsadmin/mods/db/DatabaseUser.java
index 39a0684..7bd4895 100644
--- a/hsarback/src/de/hsadmin/mods/db/DatabaseUser.java
+++ b/hsarback/src/de/hsadmin/mods/db/DatabaseUser.java
@@ -51,13 +51,13 @@ public abstract class DatabaseUser extends AbstractEntity implements Serializabl
 	@Transient
 	private String password;
 
-	@AnnFieldIO(validation="[a-zA-Z]*", rw=ReadWriteAccess.WRITEONCE)
+	@AnnFieldIO(validation="[a-zA-Z]*", rw=ReadWriteAccess.READONLY)
 	@Column(name = "engine", columnDefinition = "character varying(12)", updatable=false)
 	protected String instance;
 
 	@JoinColumn(name = "packet_id", columnDefinition = "integer", updatable=false)
 	@ManyToOne(fetch = EAGER)
-	@AnnFieldIO(validation="[a-z0-9]*", rw=ReadWriteAccess.WRITEONCE)
+	@AnnFieldIO(validation="[a-z0-9]*", rw=ReadWriteAccess.READONLY)
 	protected Pac pac;
 
 	protected DatabaseUser() {
diff --git a/hsarback/src/de/hsadmin/mods/user/UnixUser.java b/hsarback/src/de/hsadmin/mods/user/UnixUser.java
index 2653103..ed876d3 100644
--- a/hsarback/src/de/hsadmin/mods/user/UnixUser.java
+++ b/hsarback/src/de/hsadmin/mods/user/UnixUser.java
@@ -61,7 +61,7 @@ public class UnixUser extends AbstractEntity implements Serializable {
 	@Column(name = "shell", columnDefinition = "character varying(32)")
 	private String shell;
 
-	@AnnFieldIO(validation="[a-z0-9\\/\\_\\-\\.]*", rw=ReadWriteAccess.WRITEONCE)
+	@AnnFieldIO(validation="[a-z0-9\\/\\_\\-\\.]*", rw=ReadWriteAccess.READONLY)
 	@Column(name = "homedir", columnDefinition = "character varying(48)", updatable=false)
 	private String homedir;