Hello Everyone.
I have a request type of Change Request that shows an RFC form in the servicedesk portal for customers to fill out.
My issue is that I have a cascading drop-down called Project that looks like this:

I want to add that to the RFC form that is displayed to the user, but, when I try to do this I get this message:

So, I edit the RFC form, and look for the Project Jira field to link to, but it isn't listed - why?

How can I get it to appear so I can add it to the RFC form?
Many thanks.