[Lizard]

Tom's right --- IF you've somehow managed to get your hands on an unauthorized pre-beta copy of OmniPlan 1.1. We're hard at work on improving the AppleScript support in version 1.1. There's enough changes coming in this department that I feel obligated to warn you that there's a good chance your 1.0 scripts won't work with 1.1.

However, if you still really want this script for 1.0, it is possible. "every task" in 1.0 only gives you the top-level tasks, so you'll have to recursively ask each task you find for its children also.