User Help > Creating Custom Fields and Specifying Custom Field Values > Known Limitations of Custom Fields and Custom Field Values
  
Known Limitations of Custom Fields and Custom Field Values
When working with Custom Fields and Custom Field Values, note the following limitations:
On an item’s History tab:
When the project value of the project backing item changes, Custom Field Values are removed from item history.
When the project value of a participating item changes, the Custom Field Values associated with the backing project are removed from item history.
The following Windchill RV&S functional areas do not support Custom Fields or Custom Field Values:
Notification rules
Copy Fields list
Queries
Advanced Filter Definition
Document Differencing