RTC Constraint Date Type is making date attribute Read Only
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The "Constraint Date" is normally used in Formal Project Management process configuration combined with "Constraint Type". "Constraint Date" attribute is editable only when the value of "Constraint Type" is "Start No Earlier Than" or "Finish No Later Than".
To achieve your requirement, in the editor presentation. you need to use "Timestamp" as the Kind. And in the "Mode" (in the bottom), select "Date".
To achieve your requirement, in the editor presentation. you need to use "Timestamp" as the Kind. And in the "Mode" (in the bottom), select "Date".