diff --git a/imixs-workflow-engine/src/main/java/org/imixs/workflow/engine/adminp/JobHandlerRenameUser.java b/imixs-workflow-engine/src/main/java/org/imixs/workflow/engine/adminp/JobHandlerRenameUser.java
index 204f3e890..4a465dd60 100644
--- a/imixs-workflow-engine/src/main/java/org/imixs/workflow/engine/adminp/JobHandlerRenameUser.java
+++ b/imixs-workflow-engine/src/main/java/org/imixs/workflow/engine/adminp/JobHandlerRenameUser.java
@@ -217,6 +217,11 @@ public boolean updateWorkitemUserIds(ItemCollection entity, String from, String
 			return false;
 		}
 
+		if (entity.getItemValueBoolean("private")) {
+			return false;
+		}
+
+		
 		// Verify Fields
 		if (updateList(entity.getItemValue("$ReadAccess"), from, to, replace))
 			bUpdate = true;
diff --git a/src/site/markdown/administration.md b/src/site/markdown/administration.md
index 1501911d8..12ec63ffd 100644
--- a/src/site/markdown/administration.md
+++ b/src/site/markdown/administration.md
@@ -56,10 +56,13 @@ Example of a a Job Description:
 	       <item name="typelist"><value xsi:type="xs:string">workitem</value></item> 
 	       <item name="namfrom"><value xsi:type="xs:string">FROM USER ID</value></item> 
 	       <item name="namto"><value xsi:type="xs:string">NEW USER ID</value></item> 
+	       <item name="keyreplace"><value xsi:type="xs:boolean">false</value></item> 
 	</document>
 
 
-If a workitem has the item '_$private_" set to _true_ the workitem will be ignored by the job. This is useful for personal workitems which should not be delegated to the deputy. E.g. 'personnel file' or a 'application for leave'.
+If the job item 'keyReplace' is set to 'true' then the old user id will be removed.  
+
+If a workitem has the item '_private_" set to _true_ the workitem will be ignored by the job. This is useful for personal workitems which should not be delegated to the deputy. E.g. 'personnel file' or a 'application for leave'.
 
 
 ### Migration