Why a limitation of 10 items in the 'During Transition' of a blueprint?

Why a limitation of 10 items in the 'During Transition' of a blueprint?

I want the transition owner to add some values for specific field while performing the 'During transition' button. However, I want them to fill out 12 fields, but I'm not able to save the blueprint because there is a limitation of 10 items. Why is this the case? Can this be solved?