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A junction relation points at a target field on the join object that another action may create later (two junctions into the same join reference each other). The builder validator now also looks up the target in the to be created set, and the runner mints every field id up front so the target resolves regardless of action order, the same way relation pairs are already handled. --------- Co-authored-by: Félix Malfait <felix@twenty.com>