Reference-only Tasks that can't be marked complete

[ka_nishiyama]

Just for your reference,
I tried to express it using the recently introduced custom task type feature.
This doesn’t use the rules feature yet. It would be a good idea to use the rules feature as well.

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Link: “Active” & “Completed” , same appearance. (Custom task type) - English Forum / Forum Leaders tips - Asana Forum

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Help Center: Create & Use Custom Task Types & Statuses to Standardize Workflows