Okay, looking further, I see that this particular forum uses this plugin: http://vanillaforums.org/addon/subcategories-plugin to add the subcategories, and appearing below discussions is a reported p… (View Post)
For those of you still struggling to make the relationship field not required, I've worked out the secret. Note that I was not trying to remove it, just make it not required.
Step 1: Open up your … (View Post)
This has to do with the "Pick one" value not being recognized as valid by the form. I just tackled this issue myself, and posted the solution here: http://vanillaforums.org/discussion/17077/how-can-i… (View Post)