Trying to make a field dynamic based on underlying board.
A board is a view of a selection of issues, it is not a container for them. An issue could appear on many boards, so there is no "underlying board" for an issue.
Behaviours only work on issue screens too, none of which are tied to boards at all.
So, the simple answer is "no", because there is no board underneath anything.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.