FORUM ADMINISTRATOR / FORUM MODERATOR / JAZZ DEVELOPER(63.9k●3●36●48)Nov 05 '12, 5:34 a.m.
I gave it a quick look and I assume you would have to use a script based validator of severity error and use the precondition to prevent validation errors. See https://jazz.net/wiki/bin/view/Main/AttributeCustomization and be aware of the special format for timestamps.
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