When creating DIY forms, it would be great if you could add defined fields as well as UDFs. This would ensure the forms are flexible in their format and allow full control to the user, giving the option to capture all of the information needed in one place.
Yasmine, do you mind clarifying your question? UDFs are user defined fields. I am not sure which part you are unable to put onto the form, but I've never had any trouble including any field or UDFs from both the constituent level and the journal level onto a form. But maybe I am misunderstanding what you are having trouble doing.