User-defined fields created via custom form design are associated with the custom form and are not shown in the <User-defined fields in folder> or directly with the contact item.
When opening a contact item created with custom form, the user-defined fields can be viewed under the <User-defined fields in this item> list but are not listed under the <User-defined fields in folder>
User-defined fields shown for contact item created using a custom form

Empty list of user-defined fields in folder when viewed for a contact using a custom form

Notes:
| 1. | New user-defined fields should never be added to a contact associated with a custom form since this will create a one-off entry. New fields should always be added by updating the custom form definition and republishing it. |
| 2. | If the message class is changed for the contact item (no or new custom form assigned), the data for all user-defined fields associated with the original custom form will no longer be accessible. UDF information for a custom form can only be retrieved for an item when the item is associated with the form (Message Class = Custom Form Name) |