Here is a breakdown of what information should be available for each page type when adding Hidden Fields to DIY forms:


For Transaction pages, such as the Online Giving, Event Registration and Membership DIY forms:
* The Display Type on the User Defined Field must be single select or multi-select. You cannot use text fields or note fields as hidden Fields
* The Field Application must apply to Constituent, Persona, or Transactions. 


For Non Transaction pages, such as the Contact or Volunteer form:
* The Display Type on the User Defined Field must be single-select or multi-select. You cannot use text fields or note fields as hidden fields
* The Field Application must apply to Constituent, Persona, or Contacts