I am using a few lead assignment rules, which need to work ONLY on lead creation, and not on update. To that end, I tried to check the "Do Not Reassign Owner" checkbox in the rule's edit page, but when I save the rule, the checkbox returns to be unchecked! And of course, the rule reassigns the owner on any update of the lead. Any idea why I cannot check the "Do Not Reassign Owner" checkbox??
