Agrregates ant Hierarchy Level

Hello All.

I want to create an aggregate by a Hierarchy level (type H), this is easy. Now,once the aggregate is roll_up, I would like to deactivate the aggregate once the specific hierarchy used in the aggregate is modified by a user, in order to recalculate the aggregates at night time. Is there any way to do this?

Thanks a lot.

regards,

Javier.