diff --git a/model/src/main/java/li/strolch/model/activity/Action.java b/model/src/main/java/li/strolch/model/activity/Action.java
index 11d0d6082..d272297df 100644
--- a/model/src/main/java/li/strolch/model/activity/Action.java
+++ b/model/src/main/java/li/strolch/model/activity/Action.java
@@ -391,6 +391,7 @@ public String toString() {
 	public void setParent(Activity activity) {
 		assertNotReadonly();
 		this.parent = activity;
+		this.locator = null;
 	}
 
 	@Override
diff --git a/model/src/main/java/li/strolch/model/activity/Activity.java b/model/src/main/java/li/strolch/model/activity/Activity.java
index 98188d75f..9a54c5111 100644
--- a/model/src/main/java/li/strolch/model/activity/Activity.java
+++ b/model/src/main/java/li/strolch/model/activity/Activity.java
@@ -892,6 +892,7 @@ public PolicyDef findPolicy(String className, PolicyDef defaultDef) throws Strol
 	public void setParent(Activity activity) {
 		assertNotReadonly();
 		this.parent = activity;
+		this.locator = null;
 	}
 
 	/**