Cannot undo Maven POM dependency management

We have 200+ Maven plans configured on one Bamboo instance and some of them are nightly plans with a once-a-day trigger.

On upgrading to 2.5 I set all plans to use the Maven2 dependency management. The problem is that I don't want regular CI plans to trigger nightly plans(as they are resource intensive). When I remove POM dependency management from the nightly builds, it doesn't stop them from being triggered by regular CI plans. I have no choice now but to take the Maven 2 dep management off all plans.

Oh well, it was nice while it lasted.

So - any way to stop the Maven 2 dependencies from crossing from plans of one build strategy (polling) to plans of another (single daily build)?